Remove -pedantic from CFLAGS to allow building with GCC.

Index: Makefile
--- Makefile.orig
+++ Makefile
@@ -4,7 +4,7 @@ CC?=cc
 COMA=coma
 PREFIX?=/usr/local
 INSTALL_DIR=$(PREFIX)/bin
-MAN_DIR=$(PREFIX)/share/man
+MAN_DIR=$(PREFIX)/man
 
 SRC=	coma.c client.c config.c frame.c wm.c
 OBJS=	$(SRC:%.c=%.o)
@@ -19,7 +19,6 @@ CFLAGS+=-Wpointer-arith
 CFLAGS+=-Wcast-qual
 CFLAGS+=-Wsign-compare
 CFLAGS+=-std=c99
-CFLAGS+=-pedantic
 
 CFLAGS+=`pkg-config --cflags x11 xft`
 LDFLAGS+=`pkg-config --libs x11 xft`