Merge #18359: build: fix sysctl() detection on macOS

e90e3e684ffa7b25f0dfb5b45e70bb0c358261fb build: fix sysctl() detection on macOS (fanquake)

Pull request description:

  [`sysctl()` on *BSD](https://www.unix.com/man-page/FreeBSD/3/sysctl/) takes a "const int *name", whereas [`sysctl()` on macOS](https://developer.apple.com/library/archive/documentation/System/Conceptual/ManPages_iPhoneOS/man3/sysctl.3.html)
  it takes an "int *name". So our configure check and `sysctl()` detection on
  macOS currently fails:

  ```bash
  /usr/include/sys/sysctl.h:759:9: note: candidate function not viable:
  	no known conversion from 'const int [2]' to 'int *' for 1st argument
  int     sysctl(int *, u_int, void *, size_t *, void *, size_t);
  ```

  The simplest change seems to be to change the param to a "int *name", which
  will work during configure on macOS and *BSD systems.

  For consistency I've changed both calls, but note that macOS doesn't
  have `KERN_ARND`, so that check will always fail regardless. We can revert/add
  documentation if preferred.

ACKs for top commit:
  laanwj:
    Re-ACK e90e3e684ffa7b25f0dfb5b45e70bb0c358261fb

Tree-SHA512: 29e9348136fc72882f63079bf10d2490e845d7656aae2c003e282bea49dd2778204a7776a67086bd88c2852af9a07dd04ba358eede7e37029e1c10f73c85d6a5

0 files changed, 0 insertions, 0 deletions