[glibc] <string.h>: Make strchrnul, strcasestr, memmem available by default

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=30e3ca78f92be44f46851557f54b47e789bd3416

commit 30e3ca78f92be44f46851557f54b47e789bd3416
Author: Florian Weimer <fweimer@redhat.com>
Date:   Thu Apr 6 16:40:44 2023 +0200

    <string.h>: Make strchrnul, strcasestr, memmem available by default
    
    FreeBSD makes them available by default, too, so there does not seem
    to be a reason to restrict these functions to _GNU_SOURCE.
    
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 string/string.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/string/string.h b/string/string.h
index 7f0f600224..4927879ecf 100644
--- a/string/string.h
+++ b/string/string.h
@@ -274,7 +274,7 @@ extern char *strrchr (const char *__s, int __c)
      __THROW __attribute_pure__ __nonnull ((1));
 #endif
 
-#ifdef __USE_GNU
+#ifdef __USE_MISC
 /* This function is similar to `strchr'.  But it returns a pointer to
    the closing NUL byte in case C is not found in S.  */
 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
@@ -368,7 +368,7 @@ extern char *strtok_r (char *__restrict __s, const char *__restrict __delim,
      __THROW __nonnull ((2, 3));
 #endif
 
-#ifdef __USE_GNU
+#ifdef __USE_MISC
 /* Similar to `strstr' but this function ignores the case of both strings.  */
 # ifdef __CORRECT_ISO_CPP_STRING_H_PROTO
 extern "C++" char *strcasestr (char *__haystack, const char *__needle)
@@ -382,7 +382,7 @@ extern char *strcasestr (const char *__haystack, const char *__needle)
 # endif
 #endif
 
-#ifdef __USE_GNU
+#ifdef __USE_MISC
 /* Find the first occurrence of NEEDLE in HAYSTACK.
    NEEDLE is NEEDLELEN bytes long;
    HAYSTACK is HAYSTACKLEN bytes long.  */