linux

msubprojects: Fix conditions around rebase on update #13848

Job	Run time
Arch / PyPy	3m 40s
Arch Linux	2m 56s
Ubuntu Rolling (gcc, g++)	4m 7s
CUDA (on Arch)	3m 25s
Fedora	2m 47s
Ubuntu Rolling (--unity=on -Ddefault_library=static, --no-unittests, gcc, g++)	1m 53s
OpenSUSE	3m 28s
Ubuntu Rolling (-Ddefault_library=both, --no-unittests, gcc, g++)	2m 24s
Ubuntu Bionic	2m 48s
Ubuntu Rolling (clang, clang++)	3m 45s
Ubuntu Rolling (--unity=on, --no-unittests, clang, clang++)	2m 32s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, 0, gcc, g++)	1m 57s
Ubuntu Rolling (--cross ubuntu-armhf.json --cross linux-mingw-w64-64bit.json, --unity=on, gcc, g++)	1m 48s
	37m 30s

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