gnome: Added 'executable' method for GTK Android #16801

Job	Run time
Arch Linux	20m 22s
Arch / PyPy	19m 37s
CUDA (on Arch)	7m 35s
Fedora	20m 9s
Ubuntu Rolling (gcc, g++)	19m 24s
Gentoo	22m 12s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	13m 39s
OpenSUSE	16m 25s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	13m 49s
Ubuntu Bionic	14m 53s
Ubuntu Rolling (clang, clang++)	22m 7s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	15m 10s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	13m 45s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	13m 57s
	3h 53m 4s

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