Update exfat_super.c to fix a typo so that it would compile on 3.11

Typo: file -> filp
get make -f Makefile.module to work
proper formatting & use of Makefile.module
Merge pull request #25 from htruong/3.11-fix

Update exfat_super.c to fix a typo so that it would compile on 3.11
Merge pull request #26 from benpicco/master

Don't copy Makefiles around
Fixed Build error for < 3.7.y tree. TNX @twu2