language.h: Add "symtab.h" #include

In addition to the fact that language.h depends on a number of struct
types declared in symtab.h, language.h also depends on an enumerated
type (domain_enum). So language.h should #include "symtab.h".

gdb/ChangeLog:

        * language.h: Add "symtab.h" #include.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2013-11-14  Joel Brobecker  <brobecker@adacore.com>
+
+	* language.h: Add "symtab.h" #include.
+
 2013-11-13  Doug Evans  <xdje42@gmail.com>
 
 	* breakpoint.c (bpstat_check_breakpoint_conditions): For thread

gdb/language.h

@@ -23,6 +23,8 @@
 #if !defined (LANGUAGE_H)
 #define LANGUAGE_H 1
 
+#include "symtab.h"
+
 /* Forward decls for prototypes.  */
 struct value;
 struct objfile;