makedoc: Fix INTERNAL(|DEFINITION|FUNCTION) command definitions

The unused INTERNAL_DEFINITION, INTERNAL_FUNCTION and INTERNAL commands are
defined in terms of the non-existent built-in 'func'

This causes every single invocation of makedoc to output "Can't find func" three
times, as it parses doc.str.

This is normally un-noticed because makedoc's stderr is redirected to a .ref
file.

Fix these unused command definitions to something with equivalent lack of
effect, but without generating an error.

2015-11-06  Jon Turney  <jon.turney@dronecode.org.uk>

	* doc/doc.str: Fix INTERNAL_DEFINITION, INTERNAL_FUNCTION and
	INTERNAL.

Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk>

newlib/ChangeLog

@@ -1,3 +1,8 @@
+2015-11-06  Jon Turney  <jon.turney@dronecode.org.uk>
+
+	* doc/doc.str: Fix INTERNAL_DEFINITION, INTERNAL_FUNCTION and
+	INTERNAL.
+
 2015-11-12  Wilco Dijkstra  <wdijkstr@arm.com>
 
 	* newlib/libc/machine/aarch64/memcpy.S (memcpy): Further tuning for

newlib/doc/doc.str

@@ -154,13 +154,13 @@
 	"@strong{See Also}@*\n" catstr subhead ;
 
 : INTERNAL_FUNCTION
-	func ;
+	;
 
-: INTERNAL_DEFINITION 
-	func ;
+: INTERNAL_DEFINITION
+	;
 
 : INTERNAL
-	func ;
+	;
 
 : TYPEDEF
 	FUNCTION ;