Update rules.vc to latest version

Author: jan.nijtmans

win/rules.vc

@@ -24,7 +24,7 @@ _RULES_VC = 1
 # For modifications that are not backward-compatible, you *must* change
 # the major version.
 RULES_VERSION_MAJOR = 1
-RULES_VERSION_MINOR = 14
+RULES_VERSION_MINOR = 15
 
 # The PROJECT macro must be defined by parent makefile.
 !if "$(PROJECT)" == ""
@@ -1690,6 +1690,7 @@ default-install-libraries: default-install-scripts
 
 default-install-scripts: $(OUT_DIR)\pkgIndex.tcl
 	@echo Installing libraries to '$(SCRIPT_INSTALL_DIR)'
+	@if not exist "$(SCRIPT_INSTALL_DIR)" mkdir "$(SCRIPT_INSTALL_DIR)"
 	@if exist $(LIBDIR) $(CPY) $(LIBDIR)\*.tcl "$(SCRIPT_INSTALL_DIR)"
 	@echo Installing package index in '$(SCRIPT_INSTALL_DIR)'
 	@$(CPY) $(OUT_DIR)\pkgIndex.tcl $(SCRIPT_INSTALL_DIR)

win/targets.vc

@@ -53,6 +53,7 @@ default-install: default-install-stubs
 default-install: default-install-headers
 default-install-headers:
 	@echo Installing headers to '$(INCLUDE_INSTALL_DIR)'
+	@if not exist "$(INCLUDE_INSTALL_DIR)" $(MKDIR) "$(INCLUDE_INSTALL_DIR)"
 	@for %f in ($(PRJ_HEADERS_PUBLIC)) do @$(COPY) %f "$(INCLUDE_INSTALL_DIR)"
 !endif