libc: indicate existing functions that are POSIX 2024

Reviewed by:	brooks, imp
Sponsored by:	The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D47581

lib/libc/stdio/mktemp.3

@@ -275,7 +275,10 @@ function is expected to conform to
 and is not specified by
 .St -p1003.1-2008 .
 The
-.Fn mkostemp ,
+.Fn mkostemp
+function conforms to
+.St -p1003.1-2024 .
+The
 .Fn mkstemps ,
 .Fn mkostemps
 and

lib/libc/stdio/printf.3

@@ -828,6 +828,12 @@ and
 .Fn vdprintf
 conform to
 .St -p1003.1-2008 .
+The functions
+.Fn asprintf
+and
+.Fn vasprintf
+conform to
+.St -p1003.1-2024 .
 .Sh HISTORY
 The functions
 .Fn asprintf

lib/libc/stdlib/getenv.3

@@ -218,7 +218,8 @@ functions conforms to
 .St -p1003.1-2001 .
 The
 .Fn secure_getenv
-function is expected to be glibc-compatible.
+function conforms to
+.St -p1003.1-2024 .
 .Sh HISTORY
 The functions
 .Fn setenv

lib/libc/stdlib/reallocarray.3

@@ -131,6 +131,10 @@ if ((newp = reallocarray(p, num, size)) == NULL) {
 .Ed
 .Sh SEE ALSO
 .Xr realloc 3
+.Sh STANDARDS
+.Fn reallocarray
+conforms to
+.St -p1003.1-2024 .
 .Sh HISTORY
 The
 .Fn reallocarray

lib/libc/string/memmem.3

@@ -67,10 +67,10 @@ is returned.
 .Xr memchr 3 ,
 .Xr strchr 3 ,
 .Xr strstr 3
-.Sh CONFORMING TO
+.Sh STANDARDS
 .Fn memmem
-started as a GNU extension but is now available in at least
-the GNU, musl, bionic, OpenBSD, NetBSD, macOS, and illumos C runtime libraries.
+conforms to
+.St -p1003.1-2024 .
 .Sh HISTORY
 The
 .Fn memmem