msys: use gcc #278

Job	Run time
macosx	16m 52s
macosx	16m 52s
sanitizer - debian:bullseye	2m 24s
sanitizer - debian:bullseye	2m 24s
sanitizer - arm32v7/debian:bullseye	21m 41s
sanitizer - arm32v7/debian:bullseye	21m 41s
ios	4m 3s
ios	4m 3s
android	4m 49s
android	4m 49s
linux - debian:bullseye	2m 48s
linux - debian:bullseye	2m 48s
msvs	4m 17s
msvs	4m 17s
linux - arm32v7/debian:bullseye	19m 10s
linux - arm32v7/debian:bullseye	19m 10s
linux - ubuntu:focal	2m 39s
linux - ubuntu:focal	2m 39s
linux - ubuntu:jammy	2m 23s
linux - ubuntu:jammy	2m 23s
msys2 - mingw32	3m 28s
msys2 - mingw32	2m 55s
linux - igagis/raspbian:bullseye	9m 0s
linux - igagis/raspbian:bullseye	9m 0s
msys2 - mingw64	2m 48s
msys2 - mingw64	3m 8s
	3h 12m 31s

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