Merge branch 'issue-1662' into 'gtk-3-24'

Use C locale when building gtktypefuncs.c

See merge request !577
2 jobs for gtk-3-24 in 6 minutes and 15 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #215682
build

00:06:15

manual #215683
win32 allowed to fail manual
msys2-mingw32