- Allow to build using other compiler using CC env var
Merge pull request #1 from felipensp/clang_build

- Allow to build using other compiler using CC env var
Merge branch 'master' of github.com:merces/libpe into mmap
- Introduce necessary structs & constants to parse the import dir.
- Move structs related to import dir to its own file.
- Add necessary deallocations to pe_unload.
- Rename PE_FILE to pe_file_t.
- New enum SectionCharacteristics.
- New function pe_section_characteristic_name.