udev: use native instead of custom --disable-introspection logic

Makefile.am

@@ -1699,7 +1699,7 @@ src/udev/gudev/gudevenumtypes.c: src/udev/gudev/gudevenumtypes.c.template src/ud
 	$(AM_V_GEN)glib-mkenums --template $^ > \
 	    $@.tmp && mv $@.tmp $@
 
-if ENABLE_INTROSPECTION
+if HAVE_INTROSPECTION
 -include $(INTROSPECTION_MAKEFILE)
 
 src/udev/gudev/GUdev-1.0.gir: libgudev-1.0.la
@@ -1743,7 +1743,7 @@ typelibs_DATA = \
 	src/udev/gudev/GUdev-1.0.typelib
 
 CLEANFILES += $(gir_DATA) $(typelibs_DATA)
-endif # ENABLE_INTROSPECTION
+endif # HAVE_INTROSPECTION
 
 # move lib from $(libdir) to $(rootlibdir) and update devel link, if needed
 libgudev-install-move-hook:

configure.ac

@@ -56,6 +56,7 @@ AC_PROG_GCC_TRADITIONAL
 
 AC_PATH_PROG([M4], [m4])
 GTK_DOC_CHECK(1.10)
+GOBJECT_INTROSPECTION_CHECK([1.31.1])
 
 AC_CHECK_TOOL(OBJCOPY, objcopy)
 AC_CHECK_TOOL(STRINGS, strings)
@@ -455,15 +456,6 @@ AC_ARG_ENABLE([gudev],
        AS_HELP_STRING([--disable-gudev], [disable Gobject libudev support @<:@default=enabled@:>@]),
        [], [enable_gudev=yes])
 AS_IF([test "x$enable_gudev" = "xyes"], [ PKG_CHECK_MODULES([GLIB], [glib-2.0 >= 2.22.0 gobject-2.0 >= 2.22.0]) ])
-
-AC_ARG_ENABLE([introspection],
-       AS_HELP_STRING([--disable-introspection], [disable GObject introspection @<:@default=enabled@:>@]),
-       [], [enable_introspection=yes])
-AS_IF([test "x$enable_introspection" = "xyes"], [
-       AC_DEFINE([ENABLE_INTROSPECTION], [1], [enable GObject introspection support])
-       GOBJECT_INTROSPECTION_REQUIRE([1.31.1])
-])
-AM_CONDITIONAL([ENABLE_INTROSPECTION], [test "x$enable_introspection" = "xyes"])
 AM_CONDITIONAL([ENABLE_GUDEV], [test "x$enable_gudev" = "xyes"])
 
 # ------------------------------------------------------------------------------