preprocessor: error when ECL_C_ARGUMENTS_LIMIT changes

This is a canary which errors when code needs to be adjusted. When
appropriate definitions are added the error condition should be
changed accordingly.

msvc/ecl/config.h.msvc6

@@ -183,7 +183,7 @@ typedef unsigned char ecl_base_char;
 
 /*	Numb. of args. which can be passed using the C stack		*/
 /*	See cmplam.lsp if you change this value				*/
-#define ECL_C_ARGUMENTS_LIMIT 64
+#define ECL_C_ARGUMENTS_LIMIT 63
 
 /*	Maximum number of output arguments				*/
 #define ECL_MULTIPLE_VALUES_LIMIT 64

src/c/apply.d

@@ -13,6 +13,10 @@
 
 #include <ecl/ecl.h>
 
+#if !(ECL_C_ARGUMENTS_LIMIT == 63)
+#error "Please adjust code to the constant!"
+#endif
+
 cl_object
 APPLY(cl_narg n, cl_objectfn fn, cl_object *x)
 {

src/c/cfun_dispatch.d

@@ -5,6 +5,10 @@
   cfun_dispatch.c - trampolines for functions
 */
 
+#if !(ECL_C_ARGUMENTS_LIMIT == 63)
+#error "Please adjust code to the constant!"
+#endif
+
 static cl_object dispatch0 (cl_narg narg) {
   const cl_env_ptr the_env = ecl_process_env();
   cl_object fun = the_env->function;