Add -DGDK_DISABLE_DEPRECATED to CFLAGS with gtk3

Add -DGDK_DISABLE_DEPRECATED to CFLAGS when using gtk3,
as recommended in the gtk migration guide.

Signed-off-by: Víctor Enríquez <victor.quicksilver@gmail.com>
Make FacqCaptureMenu compatible with gtk3

Changes to facqcapturemenu.c to make compilation possible with gtk3.

Signed-off-by: Víctor Enríquez <victor.quicksilver@gmail.com>