Fix compile.exp error message expectation

Fix compile.exp error message expectation

commit cdaec3f3e7ea9118204f0e579bd3257234fbae63
Author: Luis Machado <lgustavo@codesourcery.com>
Date:   Thu Aug 27 02:00:16 2015 -0300
    Mention language in compile error message

regressed:

-PASS: gdb.compile/compile.exp: compile code globalvar
+FAIL: gdb.compile/compile.exp: compile code globalvar

Update the expected message.

gdb/testsuite/ChangeLog
2015-10-25  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.compile/compile.exp (compile code globalvar): Update expectation
	for a change by "Mention language in compile error message".