wpebackend-fdo: Add -Wno-c++11-narrowing
This commit https://github.com/Igalia/WPEBackend-fdo/commit/
e4c578f23359dba4d5abbd14b108f59e1b0701c1
causes this warning due to int to uint conversion without static casts
unless its fixes properly by upstream make behaviour same as g++ where
this is flagged too but only as a warning unlike clang which is pedantic
and enables it as error
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Cc: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
