wmkdep: Simplified file scanning for dependencies avoiding too many o…

…pen files

This change ensures only one include file is open at a time by storing the
included files on a dynamic list rather than scanning the tree and holding a
list of open buffers.  This new approach is a bit faster and avoids the "too
many open files" error on machines with low limits on the number of file
descriptors allocated to users.

wmake/rules/General/transform

@@ -29,8 +29,9 @@ $(OBJECTS_DIR)/%.dep : %
 	$(call VERBOSE_MESSAGE,Making dependency list for source file,$(<F))
 	@$(WM_SCRIPTS)/makeTargetDir $@
 	@$(WMAKE_BIN)/wmkdep \
+		-R '$(OBJECTS_DIR)/' '$$(OBJECTS_DIR)/' \
 		-R '$(WM_PROJECT_DIR)/' '$$(WM_PROJECT_DIR)/' \
 		-R '$(WM_THIRD_PARTY_DIR)/' '$$(WM_THIRD_PARTY_DIR)/' \
-		-I$(*D) $(LIB_HEADER_DIRS) $< > $@
+		-I$(*D) $(LIB_HEADER_DIRS) $< $@
 
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