Add .inc as a header file type.

Currently, if you were to add a directory that only contained .inc
files, this file would not be passed as an include path to the compiler.
This ensures that .inc files are also considered header files.

Author: bridadan

tools/resources/__init__.py

@@ -467,6 +467,7 @@ def add_directory(
         ".h": FileType.HEADER,
         ".hh": FileType.HEADER,
         ".hpp": FileType.HEADER,
+        ".inc": FileType.HEADER,
         ".o": FileType.OBJECT,
         ".hex": FileType.HEX,
         ".bin": FileType.BIN,