LDFLAGS changes to enable build on OSX

Small change to the unix Makefile to change the -Map syntax to be OS X/clang compatible. 

All tests (other than basics/int-long.py) pass

basics/int-long.py fails with

Assertion failed: (0 <= num && num <= 0xffffff), function emit_write_byte_code_byte_int, file ../py/emitbc.c, line 129.