GCC switched default from -fcommon to -fno-common,
leading to the following compilation errors:
multiple definition of `argv0'
multiple definition of `display'
multiple definition of `scr'
multiple definition of `font'
multiple definition of `cnorm'
multiple definition of `csel'
multiple definition of `debugflag'
multiple definition of `debugfile'
multiple definition of `cursor'
multiple definition of `framehandler'
multiple definition of `NM'
This change fixes the following warnings:
lib/libstuff/x11/keys/parsekey.c:73:2: warning: ‘XKeycodeToKeysym’ is deprecated [-Wdeprecated-declarations]
cmd/strut/ewmh.c:23:27: warning: ‘sizeof’ on array function parameter ‘struts’ will return size of ‘Rectangle *’ {aka ‘struct Rectangle *’} [-Wsizeof-array-argument]
cmd/wmii/key.c:109:3: warning: ‘XKeycodeToKeysym’ is deprecated [-Wdeprecated-declarations]
cmd/wmii/dat.h:108:7: warning: comparison of constant ‘2’ with boolean expression is always false [-Wbool-compare]