[atkmm/atkmm-2-28] NMake Makefiles: Disable warnings C4251 and C4275

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

commit 1d2a99ab75ec53f096649f57a41c706c355cc22b
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Mar 31 18:25:07 2020 +0800

    NMake Makefiles: Disable warnings C4251 and C4275
    
    Since we may be building against GLib that use __declspec(dllimport) to
    import symbols, we can safely ignore warnings C4251 and C4275, as they
    are harmless in this case as we are certain that we are really using
    those compiler directives.

 MSVC_NMake/config-msvc.mak | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/MSVC_NMake/config-msvc.mak b/MSVC_NMake/config-msvc.mak
index d0858f8..8719014 100644
--- a/MSVC_NMake/config-msvc.mak
+++ b/MSVC_NMake/config-msvc.mak
@@ -29,7 +29,7 @@ GMMPROC_DIR=$(PREFIX)\share\glibmm-$(GLIBMM_MAJOR_VERSION).$(GLIBMM_MINOR_VERSIO
 ATKMM_BASE_CFLAGS =                    \
        /Ivs$(PDBVER)\$(CFG)\$(PLAT)    \
        /I..\atk /I.\atkmm              \
-       /wd4530 /EHsc   \
+       /wd4530 /wd4251 /wd4275 /EHsc   \
        /FImsvc_recommended_pragmas.h
 
 !if $(PDBVER) > 12