Use the new cython class to avoid duplicated fixup code to remove build
paths.
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
_mask.c is generated by cython and encodes sourcepaths into
comments which are absolute. Edit them out.
Fixes buildpaths QA errors
Signed-off-by: Khem Raj <raj.khem@gmail.com>