gmid 1.8.6 "Lightbulb Sun" bugfix release

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 - add tests and compat for setresuid setresgid
 - add GEMINI_SEARCH_STRING fastcgi parameter / cgi env variable
 - manpage fix: QUERY_STRING is *not* urldecoded
 - fixed use-after-free in the fastcgi code
 - when switching user also set the groups
 - always cast is*() arguments to unsigned char
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