[glibmm] NMake Makefiles: Fix builds from Meson tarball

[Chun-wei Fan <fanchunwei src gnome org>]

commit 424fa286497d9c70c2c6d08b3f4db83fdf3f86c5
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Mar 11 23:39:30 2020 +0800

    NMake Makefiles: Fix builds from Meson tarball
    
    For the glib/src/*.[c|h].m4 sources, look also for the generated sources
    that are in untracked/glib/glibmm, so that we do not needlessly try to
    generate that file, meaning m4 will be required even in release tarballs.
    
    Somehow this did not make it into master but is in glibmm-2-62... :|

 MSVC_NMake/build-rules-msvc.mak | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/MSVC_NMake/build-rules-msvc.mak b/MSVC_NMake/build-rules-msvc.mak
index 52d1ca55..3639e55d 100644
--- a/MSVC_NMake/build-rules-msvc.mak
+++ b/MSVC_NMake/build-rules-msvc.mak
@@ -30,8 +30,9 @@ $<
 
 {..\glib\src\}.cc.m4{vs$(VSVER)\$(CFG)\$(PLAT)\glibmm\}.obj:
        @if not exist $(@D)\ $(MAKE) /f Makefile.vc CFG=$(CFG) $(@D)
-       @for %%s in ($(<D)\*.cc.m4 $(<D)\*.h.m4) do @if not exist ..\glib\glibmm\%%~ns if not exist 
$(@D)\%%~ns $(M4) -I$(<D:\=/) %%s $(<D:\=/)/template.macros.m4 > $(@D)\%%~ns
+       @for %%s in ($(<D)\*.cc.m4 $(<D)\*.h.m4) do @if not exist ..\glib\glibmm\%%~ns if not exist 
..\untracked\glib\glibmm\%%~ns if not exist $(@D)\%%~ns $(M4) -I$(<D:\=/) %%s $(<D:\=/)/template.macros.m4 > 
$(@D)\%%~ns
        @if exist $(@D)\$(<B) $(CXX) $(LIBGLIBMM_CFLAGS) $(CFLAGS_NOGL) /Fo$(@D)\ /Fd$(@D)\ /c $(@D)\$(<B)
+       @if exist ..\untracked\glib\glibmm\$(<B) $(CXX) $(LIBGLIBMM_CFLAGS) $(CFLAGS_NOGL) /Fo$(@D)\ 
/Fd$(@D)\ /c ..\untracked\glib\glibmm\$(<B)
        @if exist ..\glib\glibmm\$(<B) $(CXX) $(LIBGLIBMM_CFLAGS) $(CFLAGS_NOGL) /Fo$(@D)\ /Fd$(@D)\ /c 
..\glib\glibmm\$(<B)
 
 {..\glib\src\}.ccg{vs$(VSVER)\$(CFG)\$(PLAT)\glibmm\}.obj: