[gtk/gtk-3-24] win32/config-msvc.mak: Don't hardcode GTK_HOST to i686-pc-vsXX

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

commit 07e06fb4dd663e202fc40097ea64590c760850a7
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Tue Feb 23 17:34:13 2021 +0800

    win32/config-msvc.mak: Don't hardcode GTK_HOST to i686-pc-vsXX
    
    Instead, rely on the mechanism that we already have to set the platform string
    appropriately, eg:
    
    i686-pc-vsXX for 32-bit x86 builds
    x86_64-pc-vsXX for x64 builds
    aarch64-pc-vsXX for arm64 builds

 win32/config-msvc.mak.in | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)
---
diff --git a/win32/config-msvc.mak.in b/win32/config-msvc.mak.in
index 348481adcf..3862f45323 100644
--- a/win32/config-msvc.mak.in
+++ b/win32/config-msvc.mak.in
@@ -38,6 +38,14 @@ GLIB_COMPILE_RESOURCES = $(PREFIX)\bin\glib-compile-resources.exe
 GDBUS_CODEGEN = $(PREFIX)\bin\gdbus-codegen
 !endif
 
+!if "$(PLAT)" == "x64"
+AT_PLAT=x86_64
+!elseif "$(PLAT)" == "arm64"
+AT_PLAT=aarch64
+!else
+AT_PLAT=i686
+!endif
+
 # Please do not change anything beneath this line unless maintaining the NMake Makefiles
 GTK_VERSION = @GTK_VERSION@
 
@@ -70,7 +78,7 @@ GTK_PREPROCESSOR_FLAGS =      \
         /D_USE_MATH_DEFINES    \
         /DGTK_COMPILATION      \
         /DG_LOG_DOMAIN=\"Gtk\" \
-        /DGTK_HOST=\"i686-pc-vs$(VSVER)\"      \
+        /DGTK_HOST=\"$(AT_PLAT)-pc-vs$(VSVER)\"        \
         /DGTK_PRINT_BACKENDS=\"file\"  \
         /DGTK_PRINT_BACKEND_ENABLE_UNSUPPORTED \
         /DINCLUDE_IM_am_et     \