dlfcn: Move dlerror into libc

The symbol was moved using scripts/move-symbol-to-libc.py.

There is a minor functionality enhancement: dlerror now sets
errno if it was set as part of the exception.  (This is the result
of using %m in asprintf, to avoid the strerror PLT call.) The
previous errno value upon function return was unpredictable.
Documenting this as a feature is premature; we need to make sure
that the error codes are meaningful when they are set by the dynamic
loader.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

sysdeps/unix/sysv/linux/arc/libc.abilist

@@ -663,6 +663,7 @@ GLIBC_2.32 dirfd F
 GLIBC_2.32 dirname F
 GLIBC_2.32 div F
 GLIBC_2.32 dl_iterate_phdr F
+GLIBC_2.32 dlerror F
 GLIBC_2.32 dngettext F
 GLIBC_2.32 dprintf F
 GLIBC_2.32 drand48 F
@@ -2101,6 +2102,7 @@ GLIBC_2.34 cnd_init F
 GLIBC_2.34 cnd_signal F
 GLIBC_2.34 cnd_timedwait F
 GLIBC_2.34 cnd_wait F
+GLIBC_2.34 dlerror F
 GLIBC_2.34 execveat F
 GLIBC_2.34 mtx_destroy F
 GLIBC_2.34 mtx_init F

sysdeps/unix/sysv/linux/arc/libdl.abilist

@@ -1,7 +1,6 @@
 GLIBC_2.32 dladdr F
 GLIBC_2.32 dladdr1 F
 GLIBC_2.32 dlclose F
-GLIBC_2.32 dlerror F
 GLIBC_2.32 dlinfo F
 GLIBC_2.32 dlmopen F
 GLIBC_2.32 dlopen F