Update mex.h #105

Job	Run time
build-osx (macos-11, Release)	5m 12s
build-dockcross (manylinux1-x64, Release)	1m 3s
build-osx (macos-11, Debug)	5m 12s
build-dockcross (manylinux1-x64, Debug)	48s
build-osx (macos-m1, Release)	1s
build-dockcross (manylinux1-x86, Release)	48s
build-osx (macos-m1, Debug)	1s
build-dockcross (manylinux1-x86, Debug)	47s
build-dockcross (manylinux2014-x64, Release)	1m 22s
build-dockcross (manylinux2014-x64, Debug)	1m 14s
build-dockcross (manylinux2014-x86, Release)	1m 9s
build-dockcross (manylinux2014-x86, Debug)	1m 46s
build-dockcross (manylinux2014-aarch64, Release)	2m 24s
build-dockcross (manylinux2014-aarch64, Debug)	2m 29s
build-dockcross (windows-shared-x64-posix, Release)	2m 46s
build-dockcross (windows-shared-x64-posix, Debug)	2m 45s
	29m 47s

Provide feedback