Ensure omnibus on windows can be rebuilt multiple times

config/software/metasploit-framework.rb

@@ -1,8 +1,17 @@
 name "metasploit-framework"
+
+# Detect a local checkout of metasploit-framework at '../metasploit-framework' - i.e. for the scenario of:
+# - c:/temp/metasploit-omnibus
+# - c:/temp/metasploit-framework (A local checkout of framework to use during the build process)
+# but try and use 'C:/metasploit-framework' - as that's the metasploit-omnibus artifacts output directory
+def has_windows_metasploit_framework_repo?
+  windows? && File.exist?('../metasploit-framework') && File.expand_path(File.join(Dir.pwd, "..", "metasploit-framework")) != "c:/metasploit-framework"
+end
+
 if linux? && File.exist?("/metasploit-framework")
   # supply current version of metasploit-framework at root of filesystem
   source path: "/metasploit-framework"
-elsif windows? && File.exist?('../metasploit-framework')
+elsif has_windows_metasploit_framework_repo?
   # supply current version of metasploit-framework relative to the current directory
   source path: "../metasploit-framework"
 else