Fix build issues regarding formatter for Win32

Fixes fontconfig/fontconfig#248
10 jobs for issue/248 in 7 minutes and 24 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #3967457
gst-macos-10.15
meson macos

00:00:50

passed #3967454
meson-mingw-w64-build

00:04:48

manual #3967458
docker windows 1809 allowed to fail manual
meson msys2
passed #3967452
meson-shared-build

00:05:03

passed #3967453
meson-static-build

00:05:20

passed #3967455
docker windows 1809
meson vs2017 amd64

00:01:35

passed #3967456
docker windows 1809
meson vs2017 x86

00:01:37

passed #3967451
mingw-build

00:05:19

passed #3967449
shared-build

00:07:24

passed #3967450
static-build

00:06:07