Remove references in pref makefile to GTK and X11 files

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Fix potential crash-bug involved in examining weapons.

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Fixed 2 bugs regarding the description of the firing speed of a missile launcher.

Signed-off-by: nppangband <nppangbanddev@verizon.net>
Final NPP 6.1.1

Signed-off-by: nppangband <nppangbanddev@verizon.net>