multimedia/gtk-recordmydesktop: fix runtime

• fix runtime by correcting shebang line
• set LICENSE_FILE
• set NO_ARCH since this package does not contain platform dependent files
• seitch to USES=localbase and correct requred python version
• bump PORTREVISION to reflect package changes

PR: 220800
Reported by: timp87@gmail.com
MFH: 2018Q1