A fix similar to the one in bug 75857 needs to be applied to EFL's jhbuild infrastructure, so that patches like the one in bug 41630, which update jhbuild.modules, actually work fine in the EWS.
Closing this bug because the EFL port has been removed from trunk. If you feel this bug applies to a different upstream WebKit port and was closed in error, please either update the title and reopen the bug, or leave a comment to request this.