libtool: remove obsolete patch, vlc compiles and links without it nowadays

package/libtool/patches/patch-m4_libtool_m4

@@ -1,20 +0,0 @@
---- libtool-2.4.6.orig/m4/libtool.m4	2015-01-20 17:15:19.000000000 +0100
-+++ libtool-2.4.6/m4/libtool.m4	2015-06-04 11:48:09.000000000 +0200
-@@ -4950,7 +4950,7 @@ m4_if([$1], [CXX], [
-   _LT_TAGVAR(enable_shared_with_static_runtimes, $1)=no
-   _LT_TAGVAR(export_dynamic_flag_spec, $1)=
-   _LT_TAGVAR(export_symbols_cmds, $1)='$NM $libobjs $convenience | $global_symbol_pipe | $SED '\''s/.* //'\'' | sort | uniq > $export_symbols'
--  _LT_TAGVAR(hardcode_automatic, $1)=no
-+  _LT_TAGVAR(hardcode_automatic, $1)=yes
-   _LT_TAGVAR(hardcode_direct, $1)=no
-   _LT_TAGVAR(hardcode_direct_absolute, $1)=no
-   _LT_TAGVAR(hardcode_libdir_flag_spec, $1)=
-@@ -6308,7 +6308,7 @@ _LT_TAGVAR(hardcode_libdir_flag_spec, $1
- _LT_TAGVAR(hardcode_libdir_separator, $1)=
- _LT_TAGVAR(hardcode_minus_L, $1)=no
- _LT_TAGVAR(hardcode_shlibpath_var, $1)=unsupported
--_LT_TAGVAR(hardcode_automatic, $1)=no
-+_LT_TAGVAR(hardcode_automatic, $1)=yes
- _LT_TAGVAR(inherit_rpath, $1)=no
- _LT_TAGVAR(module_cmds, $1)=
- _LT_TAGVAR(module_expsym_cmds, $1)=