ld.so: Consolidate 2 strtouls into _dl_strtoul [BZ #21528]

There are 2 minimal strtoul implementations in ld.so:

1. __strtoul_internal in elf/dl-minimal.c.
2. tunables_strtoul in elf/dl-tunables.c.

This patch adds _dl_strtoul to replace them.  Tested builds with and
without --enable-tunables.

	[BZ #21528]
	* elf/dl-minimal.c (__strtoul_internal): Removed.
	(strtoul): Likewise.
	* elf/dl-misc.c (_dl_strtoul): New function.
	* elf/dl-tunables.c (tunables_strtoul): Removed.
	(tunable_initialize): Replace tunables_strtoul with _dl_strtoul.
	* elf/rtld.c (process_envvars): Likewise.
	* sysdeps/unix/sysv/linux/dl-librecon.h (_dl_osversion_init):
	Likewise.
	* sysdeps/generic/ldsodefs.h (_dl_strtoul): New prototype.

1 files changed, 4 insertions, 0 deletions

diff --git a/sysdeps/generic/ldsodefs.h b/sysdeps/generic/ldsodefs.h
index 695ac24c77..4508365871 100644
--- a/sysdeps/generic/ldsodefs.h
+++ b/sysdeps/generic/ldsodefs.h
@@ -254,6 +254,10 @@ extern int _dl_name_match_p (const char *__name, const struct link_map *__map)
 extern unsigned long int _dl_higher_prime_number (unsigned long int n)
      internal_function attribute_hidden;
 
+/* A stripped down strtoul-like implementation.  */
+uint64_t internal_function _dl_strtoul (const char *, char **)
+     internal_function attribute_hidden;
+
 /* Function used as argument for `_dl_receive_error' function.  The
    arguments are the error code, error string, and the objname the
    error occurred in.  */