libc: Add remove() stub

libs/libc/include/stdio.h

@@ -145,6 +145,8 @@ extern "C"
      * of the last error encountered during a call to a system or library function. */
     void perror(const char* str);
 
+    int remove(const char* pathname); // Not implemented.
+
 #ifdef __cplusplus
 }
 #endif

libs/libc/src/stdio.cpp

@@ -43,4 +43,8 @@ extern "C"
         if (s && *s) { fprintf(stderr, "%s: ", s); }
         fprintf(stderr, "%s\n", strerror(savederr));
     }
+    int remove(const char*)
+    {
+        NOT_IMPLEMENTED("remove");
+    }
 }