build: remove check for typeof

It's used in so many places without checking, that's really pointless to
check for it in macro.h.

Also remove AC_C_TYPEOF from configure.ac since we don't use -ansi.

configure.ac

diff --git a/configure.ac b/configure.ac
index a192c81..e7416f6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,7 +28,6 @@
 
 AC_PROG_CC
 AC_PROG_CC_C99
-AC_C_TYPEOF
 AM_PROG_CC_C_O
 AC_PROG_GCC_TRADITIONAL
 AC_C_BIGENDIAN

libkmod/macro.h

diff --git a/libkmod/macro.h b/libkmod/macro.h
index 10392a3..7969072 100644
--- a/libkmod/macro.h
+++ b/libkmod/macro.h
@@ -29,14 +29,8 @@
        do { (void) sizeof(char [1 - 2*!(expr)]); } while(0)
 #endif
 
-#if HAVE_TYPEOF
 #define check_types_match(expr1, expr2)		\
 	((typeof(expr1) *)0 != (typeof(expr2) *)0)
-#else
-/* Without typeof, we can only test the sizes. */
-#define check_types_match(expr1, expr2)				\
-	assert_cc(sizeof(expr1) == sizeof(expr2))
-#endif /* HAVE_TYPEOF */
 
 #define container_of(member_ptr, containing_type, member)		\
 	((containing_type *)						\