fixed generating of makefiles that don't include common.bkl and so didn't have IS_MSVC_PRJ defined

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50716 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

build/bakefiles/common.bkl

@@ -25,10 +25,6 @@
     <!-- FIXME: PalmOS is another candidate to bakefiles -->
     <set var="PLATFORM_PALMOS">0</set>
 
-    <set var="IS_MSVC_PRJ">
-        $(FORMAT in ['msvc6prj','msevc4prj','msvs2003prj','msvs2005prj'])
-    </set>
-
 
     <include file="config.bkl"/>
 

build/bakefiles/config.bkl

@@ -3,6 +3,10 @@
 
 <makefile>
 
+    <set var="IS_MSVC_PRJ">
+        $(FORMAT in ['msvc6prj','msevc4prj','msvs2003prj','msvs2005prj'])
+    </set>
+
     <set var="BUILDING_LIB" overwrite="0">0</set>
 
     <set var="CPP_DEFAULT_VALUE">