Fix special case for C2x strtol binary constant handling (BZ# 30371)

When the base is 0 or 2 and the first two characters are '0' and 'b',
but the rest are no binary digits.  In this case this is no error,
and strtol must return 0 and ENDPTR points to the 'x' or 'b'.

Checked on x86_64-linux-gnu and i686-linux-gnu.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

stdlib/tst-strtol-binary-gnu11.c

@@ -25,6 +25,7 @@
 #define __GLIBC_USE_C2X_STRTOL 0
 
 #define CHAR char
+#define WIDE 0
 #define FNPFX strto
 #define L_(C) C
 #define TEST_C2X 0