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/m68k/coldfire/libc.abilist

@@ -208,6 +208,7 @@ 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
@@ -1006,6 +1007,7 @@ GLIBC_2.4 dirfd F
 GLIBC_2.4 dirname F
 GLIBC_2.4 div F
 GLIBC_2.4 dl_iterate_phdr F
+GLIBC_2.4 dlerror F
 GLIBC_2.4 dngettext F
 GLIBC_2.4 dprintf F
 GLIBC_2.4 drand48 F

sysdeps/unix/sysv/linux/m68k/coldfire/libdl.abilist

@@ -1,7 +1,6 @@
 GLIBC_2.4 dladdr F
 GLIBC_2.4 dladdr1 F
 GLIBC_2.4 dlclose F
-GLIBC_2.4 dlerror F
 GLIBC_2.4 dlinfo F
 GLIBC_2.4 dlmopen F
 GLIBC_2.4 dlopen F

sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist

@@ -396,6 +396,7 @@ GLIBC_2.0 difftime F
 GLIBC_2.0 dirfd F
 GLIBC_2.0 dirname F
 GLIBC_2.0 div F
+GLIBC_2.0 dlerror F
 GLIBC_2.0 dprintf F
 GLIBC_2.0 drand48 F
 GLIBC_2.0 drand48_r F
@@ -2365,6 +2366,7 @@ 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/m68k/m680x0/libdl.abilist

@@ -1,6 +1,5 @@
 GLIBC_2.0 dladdr F
 GLIBC_2.0 dlclose F
-GLIBC_2.0 dlerror F
 GLIBC_2.0 dlopen F
 GLIBC_2.0 dlsym F
 GLIBC_2.1 dlopen F