Do not require libevdev to compile it

we don't use it for now, so drop the requirement.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

configure.ac

@@ -47,7 +47,6 @@ LT_INIT
 
 PKG_PROG_PKG_CONFIG()
 PKG_CHECK_MODULES(LIBUDEV, [libudev])
-PKG_CHECK_MODULES(LIBEVDEV, [libevdev >= 0.4])
 
 if test "x$GCC" = "xyes"; then
 	GCC_CXXFLAGS="-Wall -Wextra -Wno-unused-parameter -g -fvisibility=hidden"

src/Makefile.am

@@ -13,10 +13,9 @@ libratbag_la_SOURCES =			\
 	libratbag-private.h		\
 	libratbag-util.h
 
-libratbag_la_LIBADD = $(LIBEVDEV_LIBS) $(LIBUDEV_LIBS)
+libratbag_la_LIBADD = $(LIBUDEV_LIBS)
 
 libratbag_la_CFLAGS = -I$(top_srcdir)/include \
-		      $(LIBEVDEV_CFLAGS)	\
 		      $(LIBUDEV_CFLAGS)		\
 		      $(GCC_CFLAGS)
 EXTRA_libratbag_la_DEPENDENCIES = $(srcdir)/libratbag.sym