macOS

Remove unnecessary `GEM_PATH` modification #637

Job	Run time
make (test-all, --repeat-count=2, macos-14)	17m 46s
make (check, macos-14, --with-gmp)	5m 48s
make (check, macos-14, --with-jemalloc --with-opt-dir=$(brew --prefix jemalloc))	8m 19s
make (check, macos-14, --with-gcc=gcc-14)	7m 7s
make (check, macos-13)	9m 35s
make (check, macos-14)	7m 7s
make (test-bundled-gems, macos-14)	9m 44s
make (check, macos-15)	6m 36s
make (test-bundler-parallel, macos-14)	21m 51s
macOS result	3s
	1h 33m 56s

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