gbuild: try to run filter-showIncludes.awk in C locale

Perhaps it fixes build with Chinese Windows.

Change-Id: I6541b6b7bdca140eaf6940436d5c629e7e8c3d91
Reviewed-on: https://gerrit.libreoffice.org/72896
Tested-by: Jenkins
Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>

solenv/gbuild/platform/com_MSC_defs.mk

@@ -270,7 +270,7 @@ gb_COMPILERNOOPTFLAGS := -Od
 ifeq ($(gb_FULLDEPS),$(true))
 gb_COMPILERDEPFLAGS := -showIncludes
 define gb_create_deps
-| $(GBUILDDIR)/platform/filter-showIncludes.awk -vdepfile=$(1) -vobjectfile=$(2) -vsourcefile=$(3); exit $${PIPESTATUS[0]}
+| LC_ALL=C $(GBUILDDIR)/platform/filter-showIncludes.awk -vdepfile=$(1) -vobjectfile=$(2) -vsourcefile=$(3); exit $${PIPESTATUS[0]}
 endef
 else
 gb_COMPILERDEPFLAGS :=