* src/system.h: We don't need nor want bcopy.

Throw away MS-DOS crap: we don't need getpid.
* configure.in: We don't need strndup.  It was even causing
problems: because Flex includes the headers *before* us,
_GNU_SOURCE is not defined by config.h, and therefore strndup was
not visible.
* lib/xstrndup.c: New.
* src/scan-skel.l: Use it.
Be sure to initialize yylval.muscle member when scanning a MUSCLE.
* src/parse-skel.y: Use %directives instead of #defines.

src/parse-skel.y

@@ -21,6 +21,7 @@
 
 %debug
 %defines
+%verbose
 %error-verbose
 
 %{
@@ -47,8 +48,8 @@ static int yyerror PARAMS ((const char* error));
 
 %union
 {
-  char* muscle;
-  char* string;
+  char *muscle;
+  char *string;
   char character;
   int yacc;
 }