ci: Don't set `compiler-builtins-no-f16-f128` #1124

Job	Run time
build (libgccjit.so, master)	7m 57s
build (libgccjit_without_int128.so, master-without-128bit-integers)	6m 57s
build (libgccjit12.so, gcc12, --no-default-features, TEST_FLAGS='-Cpanic=abort -Zpanic-abort-test...	2m 18s
success_failures	4s
	17m 16s

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