.gitignore: adapt to new buildgcc version

1. The build folders are capitalized.
2. Add folders for build LLVM and IASL.

Change-Id: I6c752f08aa545d8878fddd373e5acbfade317ad5
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/11602
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
1 file changed