Fixed cmake flags
Added fortify-source flags
Merge pull request #342 from LocutusOfBorg/fix-cmake-flags

Fixed cmake flags
avoid redefinition warnings
fix warinigs for gtk
fix error in prototype of load_filter()
fix warninigs due to debug output in ec_encryption.c
Added link for check framework download
Added -Wextra in debug mode
Merge pull request #386 from koeppea/fix-warnings-curses

Fix warinings for the curses UI
Merge pull request #387 from koeppea/fix-warnings-gtk

fix warnings for gtk
Merge pull request #389 from koeppea/fix-warnings-wpa

fix warninigs due to debug output in ec_encryption.c
Added redundant-decls warning flag to debug build