Detect the presence of malloc_trim to fix the build with musl
malloc_trim is indeed a GNU extension, but an extension of glibc. Relying on __GNUC__ unfortunately doesn't help with that. Check for the actual presence of malloc_trim with cmake's check_function_exists instead. This fixes the build with musl libc, which doesn't come with malloc_trim. Co-authored-by: Ahmad Samir <a.samirh78@gmail.com> (cherry picked from commit f6310c2b)
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