remove config.mk, no longer necessary

config.mk

@@ -1,25 +0,0 @@
-# i3lock version
-VERSION = 1.0
-
-# Customize below to fit your system
-
-# paths
-PREFIX = /usr
-
-X11INC = /usr/X11R6/include
-X11LIB = /usr/X11R6/lib
-
-MANDIR = $(DESTDIR)$(PREFIX)/share/man
-
-# includes and libs
-INCS = -I. -I/usr/include -I${X11INC}
-LIBS = -L${X11LIB} -lX11 -lpam -lXext -lXpm -lm
-
-# flags
-CPPFLAGS = -DVERSION=\"${VERSION}\"
-CFLAGS = -std=c99 -pedantic -Wall -Os ${INCS} ${CPPFLAGS}
-LDFLAGS = ${LIBS}
-
-# compiler and linker
-CC = cc
-INSTALL=install