Generate the ImageLoader.h file from cmake after we figure out what image reading libraries are available to us.

IO/CMakeLists.txt

@@ -8,6 +8,13 @@ SET( HEADERS
 	ImageFile.h
 )
 
+CONFIGURE_FILE(
+	"ImageLoader.h.in"
+	"ImageLoader.h"
+)
+
+INCLUDE_DIRECTORIES( ${TexC_BINARY_DIR}/IO )
+
 ADD_LIBRARY(TexCompIO
 	${SOURCES}
 	${HEADERS}