process_headers: Merge header directories for some targets.

These are almost entirely identical, with these exceptions:

* lib/libc/include/csky-linux-{gnueabi,gnueabihf}
    * gnu/{lib-names,stubs}.h will need manual patching for float ABI.
* lib/libc/include/{powerpc-linux-{gnueabi,gnueabihf},{powerpc64,powerpc64le}-linux-gnu}
    * bits/long-double.h will need manual patching for long double ABI.
dc760492a4Alex Rønne Petersen committed on 5/29/2025, 9:38:28 PMparentc04be63
1 file changedLine totals unavailable