on WNT the gb_Helper_set_ld_path must contain backslashes

... or at least with forward slashes cppunittester doesn't run at all in
an MSVC 2008 _DEBUG build.

Change-Id: I889ff0375067877d42f11fad9773c476e9e5c52c

solenv/gbuild/platform/com_MSC_defs.mk

@@ -291,6 +291,7 @@ gb_LTOFLAGS := $(if $(filter TRUE,$(ENABLE_LTO)),-GL)
 gb_Helper_OUTDIRLIBDIR := $(OUTDIR)/bin
 gb_Helper_OUTDIR_FOR_BUILDLIBDIR := $(OUTDIR_FOR_BUILD)/bin
 
-gb_Helper_set_ld_path := PATH="$${PATH}:$(shell cygpath -u $(OUTDIR)/bin)"
+# need windows path with backslashes here
+gb_Helper_set_ld_path := PATH="$(shell cygpath -w $(OUTDIR)/bin)"
 
 # vim: set noet sw=4: