Quote the shell call in mkdir and rmdir

Allows the use of bash in windows

Author: theotherjimmy

tools/export/makefile/Makefile.tmpl

@@ -9,8 +9,8 @@ ifeq ($(shell echo $$OS),$$OS)
     MAKEDIR = if not exist "$(1)" mkdir "$(1)"
     RM = rmdir /S /Q "$(1)"
 else
-    MAKEDIR = $(SHELL) -c "mkdir -p \"$(1)\""
-    RM = $(SHELL) -c "rm -rf \"$(1)\""
+    MAKEDIR = '$(SHELL)' -c "mkdir -p \"$(1)\""
+    RM = '$(SHELL)' -c "rm -rf \"$(1)\""
 endif
 
 # Move to the build directory