Added a dummy system() function

git-svn-id: svn://svn.cc65.org/cc65/trunk@2171 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/Makefile

@@ -51,6 +51,7 @@ C_OBJS =	_afailed.o	\
                 strftime.o      \
 		strxfrm.o	\
 		strtok.o	\
+                system.o        \
                 timezone.o      \
 		vprintf.o       \
                 vsscanf.o

libsrc/common/system.c

@@ -0,0 +1,20 @@
+/*
+ * system.c
+ *
+ * Stefan Haubenthal, 2003-05-26
+ * Ullrich von Bassewitz, 2003-05-27
+ */
+
+#include <stdlib.h>
+
+int system (const char* s)
+{
+    if (s == NULL) {
+        return 0;               /* no shell */
+    } else {
+        return -1;              /* always fail */
+    }
+}
+
+
+