Add RTLD_DEEPBIND existence check (fix builds on Alpine Linux) #196
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Closes #187.
Checks for
RTLD_DEEPBINDdirectly, rather than checking for__APPLE__and__FreeBSD__This was causing build failures in Alpine Linux, which uses
muslinstead ofglibcand does not includeRTLD_DEEPBIND:https://git.musl-libc.org/cgit/musl/tree/include/dlfcn.h