makepkg-git-i686: ensure that MINGW_ARCH=mingw32 works

This needs the `/etc/msystem.d/` files...

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

.sparse/makepkg-git-i686

@@ -168,3 +168,6 @@
 # For a functional 32-bit `tclsh` so that git-gui can be built
 /mingw32/bin/wish.exe
 /mingw32/lib/tcl8.6/
+
+# To let MINGW_ARCH=mingw32 work
+/etc/msystem.d/