fcstat: add support for wasm-emscripten

fallback to f_type statfs struct field, since f_fstypename is not supported on the platform.
11 jobs for wasm-emscripten in 10 minutes and 28 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Build
passed meson android arm64 fedora #11552896

00:01:42

passed meson macos #11552894
gst-macos-10.15

00:03:13

passed meson-mingw-w64-build #11552891

00:08:16

manual meson msys2 #11552895
docker windows 1809 allowed to fail manual
passed meson-shared-build #11552889

00:08:06

passed meson-static-build #11552890

00:08:38

passed meson vs2017 amd64 #11552892
docker windows 1809

00:01:17

passed meson vs2017 x86 #11552893
docker windows 1809

00:01:16

passed mingw-build #11552888

00:08:28

passed shared-build #11552886

00:10:28

passed static-build #11552887

00:08:45