Add explicit #include of "value.h".

gdb/gdbarch.sh

@@ -632,6 +632,9 @@ cat <<EOF
 #define GDBARCH_H
 
 #include "dis-asm.h" /* Get defs for disassemble_info, which unfortunately is a typedef. */
+#if !GDB_MULTI_ARCH
+#include "value.h" /* For default_coerce_float_to_double which is referenced by a macro.  */
+#endif
 
 struct frame_info;
 struct value;
@@ -1127,6 +1130,7 @@ cat <<EOF
 #include "gdbthread.h"
 #include "annotate.h"
 #include "symfile.h"		/* for overlay functions */
+#include "value.h"		/* For old tm.h/nm.h macros.  */
 #endif
 #include "symcat.h"