The all_cppflags change paths to filename which cause file name too long
error when the path is longer than NAME_MAX (usually 255). Strip srcdir
to fix the problem.
[YOCTO #8313]
(From OE-Core rev: 9bfec97d5051992d2be3cbeecf800efc87a415f3)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>