Fix: Support Clang 17+ on macOS by using system zlib#62
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What this does
This patch fixes build issues on newer macOS systems (like Apple Silicon Macs running Clang 17 or higher). It checks the Clang version and adds --with-system-zlib if needed, which avoids problems with fdopen() in zlib.
Why it's needed
Clang 17+ doesn’t play nice with the bundled zlib—it causes build errors because of a missing fdopen() macro. Using the system zlib fixes that.
Also includes
Support for both Homebrew and MacPorts to locate gmp, mpfr, and libmpc
Clean integration with the existing TARG_XTRA_OPTS logic
Tested on
macOS Sonoma (M4 Mac Mini)
Homebrew + Clang 17+
NOTE: Similiar fix is in the pipeline for KOS.