Partially fix building gmp on Apple Silicon

[omus]

This PR fixes these two problem when building GMP from source on Apple silicon:

checking build system type... Invalid configuration `arm64-apple-darwin20.2.0': machine `arm64-apple' not recognized
configure: error: /bin/sh /Users/omus/Development/Julia/arm64/latest-src/deps/srccache/gmp-6.2.0/config.sub arm64-apple-darwin20.2.0 failed

 clang -mmacosx-version-min=10.9 -mcpu=apple-a12 -integrated-as -c -DHAVE_CONFIG_H -I. -I/Users/omus/Development/Julia/arm64/latest-src/deps/srccache/gmp-6.2.0/mpn -I.. -D__GMP_WITHIN_GMP -I/Users/omus/Development/Julia/arm64/latest-src/deps/srccache/gmp-6.2.0 -DOPERATION_bdiv_q_1 -O2 -pedantic -march=armv8-a tmp-bdiv_q_1.s -fno-common -DPIC -o .libs/bdiv_q_1.o
tmp-bdiv_q_1.s:75:2: error: ADR/ADRP relocations must be GOT relative
 adrp x7, :got:__gmp_binvert_limb_table
 ^
tmp-bdiv_q_1.s:75:2: error: unknown AArch64 fixup kind!
 adrp x7, :got:__gmp_binvert_limb_table
 ^
tmp-bdiv_q_1.s:77:2: error: unknown AArch64 fixup kind!
 ldr x7, [x7, #:got_lo12:__gmp_binvert_limb_table]
 ^
make[3]: *** [Makefile:768: bdiv_q_1.lo] Error 1

Unfortunately, there yet another problem:

tmp-bdiv_q_1.s:74:12: error: expected ')' in parentheses expression
 LEA_HI( x7, ___gmp_binvert_limb_table)
           ^
tmp-bdiv_q_1.s:74:8: error: invalid operand
 LEA_HI( x7, ___gmp_binvert_limb_table)
       ^
tmp-bdiv_q_1.s:76:12: error: expected ')' in parentheses expression
 LEA_LO( x7, ___gmp_binvert_limb_table)
           ^
tmp-bdiv_q_1.s:76:8: error: invalid operand
 LEA_LO( x7, ___gmp_binvert_limb_table)
       ^
make[3]: *** [Makefile:768: bdiv_q_1.lo] Error 1

My best guess is that gmp-apple-arm64.patch introduced in #36616 needs to be revised.

[Keno]

Can you try bumping GMP to 6.2.1 and removing the patch? Their release notes for 6.2.1 specifically call out Apple Silicon support.

[omus]

Looks like GMP 6.2.1 is the answer. I'll close this and open a new PR