Update error RegExp to decrease false positives

Currently, things like "-Wno-error" give a false positive on possible
errors in the compilation process. This commit fixes this.
keep track of all extensions to correctly define  in module
Merge pull request #671 from boegel/list_all_exts

keep track of all extensions to correctly define $EBEXTSLIST in module
Merge pull request #667 from wpoely86/develop

Search for patch file in directory of the easyconfig file
Merge pull request #669 from wpoely86/my-changes

Update error RegExp to decrease false positives