None of these changes are necessary with the slim standalone shim layer.

src/pages.c:
- include mrs header (1 line), which does the following:
  - replace mmap calls with mrs_mmap calls (3 lines)
  - replace munmap call with mrs_munmap call (1 line)
  - replace madvise call with mrs_madvise call (7 lines)
  * preprocessor defs to do mrs replacements take up 5 lines

include/size_classes.h:
- change minimum alignment for TINY allocations to 16 bytes (1 line)