Include coff/sym.h from coff/ecoff.h

coff/ecoff.h refers to some names defined in coff/sym.h.  Include the
latter from the former, so that users of the header don't need to know
this detail.

2019-01-22  Tom Tromey  <tom@tromey.com>

	* coff/ecoff.h: Include coff/sym.h.

include/ChangeLog

@@ -1,3 +1,7 @@
+2019-01-22  Tom Tromey  <tom@tromey.com>
+
+	* coff/ecoff.h: Include coff/sym.h.
+
 2018-06-24  Nick Clifton  <nickc@redhat.com>
 
 	2.32 branch created.

include/coff/ecoff.h

@@ -22,6 +22,8 @@
 #ifndef ECOFF_H
 #define ECOFF_H
 
+#include "coff/sym.h"
+
 /* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on
    little endian machines.  MIPS_MAGIC_BIG is used on big endian
    machines.  Where is MIPS_MAGIC_1 from?  */