Those two are rarely used features and better to have the extra heap.

It's relatively small (between 44 and 56 bytes) and helps to reduce heap
pressure and fragmentation during compilation.

Adding a line-end makes the determination of skip_native fail as it compares
the output against b'CRASH' while it is in fact b'CRASH\n'

Saves a few bytes of code space and eliminates need for rot_two
bytecode (hence saving RAM and execution time, by a tiny bit).

This fixes errors like these ones:

modffi.c: In function 'return_ffi_value':
modffi.c:143:29: error: cast to pointer from integer of different size
[-Werror=int-to-pointer-cast]
             const char *s = (const char *)val;
                             ^
modffi.c:162:20: error: cast to pointer from integer of different size
[-Werror=int-to-pointer-cast]
             return (mp_obj_t)val;
                    ^
modffi.c: In function 'ffifunc_call':
modffi.c:358:25: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
             values[i] = (ffi_arg)a;
                         ^
modffi.c:373:25: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
             values[i] = (ffi_arg)s;
                         ^
modffi.c:381:25: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
             values[i] = (ffi_arg)bufinfo.buf;
                         ^
modffi.c:384:25: error: cast from pointer to integer of different size
[-Werror=pointer-to-int-cast]
             values[i] = (ffi_arg)p->func;
                         ^

These errors can be highlighted when building micropython from MIPS64
n32 because ffi_arg is 64-bit wide and the pointers on MIPS64 n32 are
32-bit wide, so it's trying to case an integer to a pointer (or
vice-versa) of a different size. We should cast first the pointer (or the
integer) to a pointer sized integer (intptr_t) to fix that problem.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>

Test possible combinations of single and double quotes with escaped
quotes and parenthesis with and without function calls in REPL.

Covers: #1419

Escaped quotes are now recognised correctly in REPL when used
inside normal quotes.

Fixes: #1419

Follow the same format as other ports using the macro to include
the HAL header.

So far, no signature check is done (TODO).