mips: return X264_CPU_MSA directly if not linux in x264_cpu_detect(void)

10 jobs for master in 7 minutes and 25 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed #391989
aarch64 docker
build-debian-aarch64

00:06:58

passed #391988
amd64 docker
build-debian-amd64

00:02:09

passed #391992
macos
build-macos

00:01:41

passed #391990
amd64 docker
build-win32

00:02:12

passed #391991
amd64 docker
build-win64

00:02:04

 
  Test
passed #391994
aarch64 docker
test-debian-aarch64

00:00:23

passed #391993
amd64 docker
test-debian-amd64

00:00:14

passed #391997
macos
test-macos

00:00:03

passed #391995
amd64 docker
test-win32

00:00:19

passed #391996
amd64 docker
test-win64

00:00:14