#include <stdlib.h> in the C++ case and declare getenv and realloc

in the C case so that we don't have to depend on stdlib.h being
present.

Submitted by:	Bruce Evans <bde@freefall.freebsd.org>

usr.bin/yacc/skeleton.c

@@ -33,7 +33,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: skeleton.c,v 1.12 1997/03/22 01:48:17 bde Exp $
+ *	$Id: skeleton.c,v 1.13 1997/04/28 03:36:13 steve Exp $
  */
 
 #ifndef lint
@@ -68,8 +68,18 @@ char *banner[] =
     "#define yyclearin (yychar=(YYEMPTY))",
     "#define yyerrok (yyerrflag=0)",
     "#define YYRECOVERING (yyerrflag!=0)",
+    "#if defined(c_plusplus) || defined(__cplusplus)",
+    /* Declaring standard functions is too painful for C++. */
+    "#include <stdlib.h>",
+    "#else",
+    /* Declare standard functions to avoid depending on <stdlib.h>. */
+    "extern char *getenv();",
+    "extern void *realloc();",
+    "#endif",
+#if 0
     "extern int yylex();",
     "extern int yyparse();",
+#endif
     "static int yygrowstack();",
     0
 };