test-rawmemchr: make more robust * modules/rawmemchr-tests (Files): Add zerosize-ptr.h, mmap-anon.m4. (Depends-on, configure.ac): Add needed prerequisites to use it. * modules/memchr-tests (Files, Depends-on, configure.ac): Likewise, to avoid implicit reliance on memchr module prereqs. * tests/test-memchr.c (main): Ensure proper masking. * tests/test-rawmemchr.c (main): Likewise. Detect oversized reads. Signed-off-by: Eric Blake <eblake@redhat.com>

--- a/tests/test-memchr.c
+++ b/tests/test-memchr.c
@@ -57,6 +57,7 @@
 
   ASSERT (MEMCHR (input + 1, 'a', n - 1) == input + n - 1);
   ASSERT (MEMCHR (input + 1, 'e', n - 1) == input + n - 2);
+  ASSERT (MEMCHR (input + 1, 0x789abc00 | 'e', n - 1) == input + n - 2);
 
   ASSERT (MEMCHR (input, 'f', n) == NULL);
   ASSERT (MEMCHR (input, '\0', n) == NULL);