Merge bitcoin/bitcoin#23909: build: use a static .tiff for macOS .dmg rather than generating

e09773d20a9230ba7aa2cbb7e87fdc5187ddfec6 build: use a static .tiff for macOS .dmg over generating (fanquake)

Pull request description:

  For demonstration, after [discussion in #23778](https://github.com/bitcoin/bitcoin/pull/23778#issuecomment-1003005503), and the question as to why we can't just have a `background.tiff` that we copy into the macOS DMG, and do away with the somewhat convoluted image generation steps.

  From my understanding, the only reason we have this image generation as part of our build system is so that forks of Core can adapt the imagery for their own branding via `PACKAGE_NAME`. It don't think it provides much value to us, and could just have a static .tiff that we copy into the dmg (replacing the .svg that currently lives in macdeploy/).

  Doing this would eliminate the following build dependencies:

  For native macOS:
  * `sed` (usage in Makefile.am)
  * `librsvg` (rsvg-convert)
  * `tiffutil`

  Linux macOS cross-compile:
  * `sed` (usage in Makefille.am)
  * `librsvg`
  * `tiffcp`
  * `convert` (imagemagick)
  * `font-tuffy`

  Guix Build:
  ```bash
  bash-5.1# find guix-build-$(git rev-parse --short=12 HEAD)/output/ -type f -print0 | env LC_ALL=C sort -z | xargs -r0 sha256sum
  c98d67796863f4b1bab0ad600d46bd74e744d94072cbd4bc856a6aeaba3bb329  guix-build-e09773d20a92/output/dist-archive/bitcoin-e09773d20a92.tar.gz
  3336f90bab312798cb7665e2b4ae24d1a270fb240647d5fed8dbfcd83e3ed37e  guix-build-e09773d20a92/output/x86_64-apple-darwin/SHA256SUMS.part
  8fd680c7ee158c64bad212385df7b0b302c6c2143d4e672b4b0eb5da41f9256d  guix-build-e09773d20a92/output/x86_64-apple-darwin/bitcoin-e09773d20a92-osx-unsigned.dmg
  34f54177c2f0700e8cfaf5d85d91e404807cd9d411e22006cdff82653e5f4af2  guix-build-e09773d20a92/output/x86_64-apple-darwin/bitcoin-e09773d20a92-osx-unsigned.tar.gz
  da6b8f54ef755d40330c8eac4f5bd0329637e827be9ee61318600d5d0bdcc3dc  guix-build-e09773d20a92/output/x86_64-apple-darwin/bitcoin-e09773d20a92-osx64.tar.gz
  ```

  ![dmg](https://user-images.githubusercontent.com/863730/147847717-8121c2d2-cdd4-4781-8397-3bf2893d52cc.png)

ACKs for top commit:
  hebasto:
    ACK e09773d20a9230ba7aa2cbb7e87fdc5187ddfec6
  jarolrod:
    ACK e09773d20a9230ba7aa2cbb7e87fdc5187ddfec6
  Zero-1729:
    ACK e09773d20a9230ba7aa2cbb7e87fdc5187ddfec6

Tree-SHA512: 0ad06699a5451daa8cfaaa46759eb7bd85254a72e23f857f70d433a2ffb1a4bf6dd464d9c4ac9f8c20aab045f4e2b61c6dcdcbcceef96ce515b1a0c501665b1f

2 files changed, 0 insertions, 7 deletions

diff --git a/doc/build-osx.md b/doc/build-osx.md
index 467feff410..16dc224aed 100644
--- a/doc/build-osx.md
+++ b/doc/build-osx.md
@@ -35,7 +35,6 @@ The following dependencies are **optional** packages required for deploying:
 
 Library                                             | Purpose          | Description
 ----------------------------------------------------|------------------|----------------------
-[librsvg](https://formulae.brew.sh/formula/librsvg) | Deploy Dependency| Library to render SVG files
 [ds_store](https://pypi.org/project/ds-store/)      | Deploy Dependency| Examine and modify .DS_Store files
 [mac_alias](https://pypi.org/project/mac-alias/)    | Deploy Dependency| Generate/Read binary alias and bookmark records
 
@@ -219,10 +218,6 @@ This command depends on a couple of python packages, so it is required that you
 Ensuring that `python` is installed, you can install the deploy dependencies by running the following commands in your terminal:
 
 ``` bash
-brew install librsvg
-```
-
-``` bash
 pip3 install ds_store mac_alias
 ```
 
diff --git a/doc/dependencies.md b/doc/dependencies.md
index 24422f1d7b..f02d433dc5 100644
--- a/doc/dependencies.md
+++ b/doc/dependencies.md
@@ -16,7 +16,6 @@ These are the dependencies currently used by Bitcoin Core. You can find instruct
 | libevent | [2.1.12-stable](https://github.com/libevent/libevent/releases) | [2.0.21](https://github.com/bitcoin/bitcoin/pull/18676) | No |  |  |
 | libnatpmp | git commit [4536032...](https://github.com/miniupnp/libnatpmp/tree/4536032ae32268a45c073a4d5e91bbab4534773a) |  | No |  |  |
 | libpng |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
-| librsvg | |  |  |  |  |
 | MiniUPnPc | [2.2.2](https://miniupnp.tuxfamily.org/files) |  | No |  |  |
 | PCRE |  |  |  |  | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
 | Python (tests) |  | [3.6](https://www.python.org/downloads) |  |  |  |
@@ -46,5 +45,4 @@ Some dependencies are not needed in all configurations. The following are some f
 * ZeroMQ is needed only with the `--with-zmq` option.
 
 #### Other
-* librsvg is only needed if you need to run `make deploy` on (cross-compilation to) macOS.
 * Not-Qt-bundled zlib is required to build the [DMG tool](../contrib/macdeploy/README.md#deterministic-macos-dmg-notes) from the libdmg-hfsplus project.