tools/mpy-tool.py: Add checks for critical configuration vars.

When an mpy file is frozen it must know the values of certain
configuration variables.  This patch provides an explicit check in the
generated C file that the configuration variables are what they are
supposed to be.

tools/mpy-tool.py

@@ -450,6 +450,23 @@ def freeze_mpy(qcfgs, base_qstrs, raw_codes):
     print('#include "py/emitglue.h"')
     print()
 
+    print('#if MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE')
+    print('#error "MICROPY_OPT_CACHE_MAP_LOOKUP_IN_BYTECODE not supported with frozen mpy files"')
+    print('#endif')
+    print()
+
+    print('#if MICROPY_LONGINT_IMPL != %u' % config.MICROPY_LONGINT_IMPL)
+    print('#error "incompatible MICROPY_LONGINT_IMPL"')
+    print('#endif')
+    print()
+
+    if config.MICROPY_LONGINT_IMPL == config.MICROPY_LONGINT_IMPL_MPZ:
+        print('#if MPZ_DIG_SIZE != %u' % config.MPZ_DIG_SIZE)
+        print('#error "incompatible MPZ_DIG_SIZE"')
+        print('#endif')
+        print()
+
+
     print('#if MICROPY_PY_BUILTINS_FLOAT')
     print('typedef struct _mp_obj_float_t {')
     print('    mp_obj_base_t base;')