optionally generate .sbr files based on env-var USE_BROWSEINFO

dtool/pptempl/Global.msvc.pp

@@ -57,7 +57,11 @@
 #defer SED ppremake -s "$[script]" <$[source] >$[target]
 
 // Define this if we want to make .sbr files.
+#if $[USE_BROWSEINFO]
 #defer BROWSEINFO_FLAG /Fr"$[osfilename $[target:%.obj=%.sbr]]"
+#else
+#define BROWSEINFO_FLAG
+#endif
 #defer CFLAGS_SHARED
 
 #defer OPTFLAGS /O2 /Ob1 /Ogity /G6