Strip mingw binaries #803

Job	Run time
Mac-os	1m 39s
Mac-os-aarch64	42s
Android (21.4.7075529)	2m 51s
Linux-musl (travis-core-linux-musl)	1m 58s
Android (16.1.4479499)	2m 17s
Linux-musl (travis-core-linux-musl-apicheck)	1m 21s
Mac-os-aarch64-cctools	2m 5s
Android (26.1.10909125)	1m 46s
Mac-os-cctools	2m 2s
Linux-musl (travis-core-linux-musl-aarch64)	1m 24s
Windows-mingw (win32)	1m 58s
Windows-visual-studio (Win32)	1m 3s
Windows-mingw (x64)	1m 36s
Windows-visual-studio (x64)	1m 49s
Windows-visual-studio (ARM)	1m 24s
Windows-visual-studio (ARM64)	1m 48s
Mac-os-universal-cctools	11s
Mac-os-universal	13s
Notify-success	3s
	28m 10s

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