Readd TARGET_H to the list of exported plugin headers, fixing PR plugins/56754.

TARGET_H was removed in commit 188166, however several plugins need it, see the
PR for details.  Applying under the trivial rule.

From-SVN: r199144

gcc/ChangeLog

+2013-05-21  Magnus Granberg  <baldrick@free.fr>
+
+	PR plugins/56754
+	* Makefile.in (PLUGIN_HEADERS): Add TARGET_H
+
 2013-05-21  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/57318

gcc/Makefile.in

@@ -4646,7 +4646,8 @@ PLUGIN_HEADERS = $(TREE_H) $(CONFIG_H) $(SYSTEM_H) coretypes.h $(TM_H) \
   $(C_PRAGMA_H)  $(CPPLIB_H)  $(FUNCTION_H) \
   cppdefault.h flags.h $(MD5_H) params.def params.h prefix.h tree-inline.h \
   $(GIMPLE_PRETTY_PRINT_H) realmpfr.h \
-  $(IPA_PROP_H) $(RTL_H) $(TM_P_H) $(CFGLOOP_H) $(EMIT_RTL_H) version.h
+  $(IPA_PROP_H) $(TARGET_H) $(RTL_H) $(TM_P_H) $(CFGLOOP_H) $(EMIT_RTL_H) \
+  version.h
 
 # generate the 'build fragment' b-header-vars
 s-header-vars: Makefile