gnome-doc-utils: drop the usage of create_wrapper

gnome-doc-utils: drop the usage of create_wrapper

create_wrapper was previously abused to invoke the Python interpretter directly
instead of relying on #! parsing, which is read into a 128 byte buffer so breaks
with deep build directories.

However now that we already install a "nativepython" binary into the native
sysroot, use sed to change the #! line to /usr/bin/env nativepython.

(From OE-Core rev: 470a67d9047ccabe3b624238f31c0381793404be)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>