These patches finish moving targa file handling into d3dx9.
-- v3: d3dx9: Add support for decoding targa files with a color map in d3dx9. d3dx9: Add support for decoding targa files with run length encoding in d3dx9. d3dx9: Add support for decoding targa files with different pixel orders in d3dx9. d3dx9: Add support for loading basic targa images without WIC. d3dx9/tests: Add more tests for loading targa files.