meson build: add missing sse2 compiler flags to babl library build

4 jobs for build-meson-fix in 2 minutes and 31 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #289344
latest-autotools-lcms

00:02:04

passed #289345
latest-autotools-nolcms

00:02:30

passed #289342
latest-meson-lcms

00:01:04

passed #289343
latest-meson-nolcms

00:01:55