Build

Fixed linking of _rmt_(Bind|Unbind)Metal when including from Obj-C++ #148

Job	Run time
build-macos (linux, x64, release)	13s
build-android (android, armv7, release, 21)	39s
build-linux (linux, x86)	24s
build-android (android, arm64, release, 21)	47s
build-windows (windows, x86, debug, 14.3)	15s
build-linux (linux, x64)	22s
build-windows (windows, x86, debug, 14.2)	20s
build-windows (windows, x86, debug, 14.1)	14s
build-windows (windows, x86, release, 14.3)	15s
build-windows (windows, x86, release, 14.2)	20s
build-windows (windows, x86, release, 14.1)	15s
build-windows (windows, x64, debug, 14.3)	16s
build-windows (windows, x64, debug, 14.2)	20s
build-windows (windows, x64, debug, 14.1)	13s
build-windows (windows, x64, release, 14.3)	13s
build-windows (windows, x64, release, 14.2)	19s
build-windows (windows, x64, release, 14.1)	16s
	5m 41s

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