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add aarch64 compile #67

Job	Run time
build (linux, x64, x86_64-pc-linux-gnu, libgmp.so.10.5.0, libgmpxx.so.4.7.0, strip)	1m 37s
build (linux, x86, i686-pc-linux-gnu, libgmp.so.10.5.0, libgmpxx.so.4.7.0, strip)	1m 44s
build (linux, arm64, aarch64-linux-gnu, libgmp.so.10.5.0, libgmpxx.so.4.7.0, aarch64-linux-gnu-st...	2m 4s
build (linux, arm, arm-linux-gnueabihf, libgmp.so.10.5.0, libgmpxx.so.4.7.0, arm-linux-gnueabihf-...	1m 55s
build (win, x64, x86_64-w64-mingw32, libgmp-10.dll, libgmpxx-4.dll, x86_64-w64-mingw32-strip)	2m 32s
build (win, x86, i686-w64-mingw32, libgmp-10.dll, libgmpxx-4.dll, i686-w64-mingw32-strip)	3m 15s
build (win, arm64, aarch64-w64-mingw32, libgmp-10.dll, libgmpxx-4.dll, aarch64-w64-mingw32-strip)	45m 59s
	59m 6s

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