package/libfribidi: add upstream security fix

Fixes the following security issue:

- CVE-2019-18397: GNU FriBidi stack buffer overflow >= 1.0.0

For more details, see the advisory:
https://www.openwall.com/lists/oss-security/2019/11/08/5



Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>