Fix Findallegro.cmake on case-sensitive filesystems

Signed-off-by: Mloc-Hibernia <colmohici@gmail.com>
More coverage for (c)makefiles in .gitignore

Signed-off-by: Mloc-Hibernia <colmohici@gmail.com>
Merge pull request #1 from Mloc/dev

CMake fix on Unix + more .gitignore