Fix -Wundef related warnings

Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>

ldso/include/dl-string.h

@@ -257,7 +257,7 @@ static __always_inline char * _dl_simple_ltoahex(char *local, unsigned long i)
 /* On some (wierd) arches, none of this stuff works at all, so
  * disable the whole lot... */
 /* The same applies for ARM FDPIC at least for the moment.  */
-#if defined(__mips__) || (__FDPIC__)
+#if defined(__mips__) || defined(__FDPIC__)
 
 # define SEND_STDERR(X)
 # define SEND_ADDRESS_STDERR(X, add_a_newline)

libc/misc/fnmatch/fnmatch_loop.c

@@ -620,7 +620,7 @@ FCT (const CHAR *pattern, const CHAR *string, const CHAR *string_end,
 
 		    if (c == L('-') && *p != L(']'))
 		      {
-#if _LIBC
+#ifdef _LIBC
 			/* We have to find the collation sequence
 			   value for C.  Collation sequence is nothing
 			   we can regularly access.  The sequence

libc/misc/regex/regex_internal.h

@@ -58,7 +58,7 @@
 #define gettext(msgid)       (msgid)
 #define gettext_noop(String) String
 
-#if (defined MB_CUR_MAX && HAVE_LOCALE_H && HAVE_WCTYPE_H && HAVE_WCHAR_H && HAVE_WCRTOMB && HAVE_MBRTOWC && HAVE_WCSCOLL)
+#if (defined MB_CUR_MAX && defined HAVE_LOCALE_H && defined HAVE_WCTYPE_H && defined HAVE_WCHAR_H && defined HAVE_WCRTOMB && defined HAVE_MBRTOWC && defined HAVE_WCSCOLL)
 # define RE_ENABLE_I18N
 #endif
 

libpthread/nptl/pthread_create.c

@@ -447,7 +447,7 @@ pthread_create (
      performed in 'get_cached_stack'.  This way we avoid doing this if
      the stack freshly allocated with 'mmap'.  */
 
-#if TLS_TCB_AT_TP
+#ifdef TLS_TCB_AT_TP
   /* Reference to the TCB itself.  */
   pd->header.self = pd;