openblas: fix build with musl libc
Add upstream patches to avoid use of __GLIBC_PREREQ when this macro is
not defined.
Fixes:
http://autobuild.buildroot.net/results/f13/
f13d93372449c9bf1b3c79ed056b8d820470ae89/
http://autobuild.buildroot.net/results/e1c/
e1cdcdfe15b4af523c7db71952ac25163733ffb1/
http://autobuild.buildroot.net/results/778/
77821a4a37171080fc7ee917862e77babeb06b88/
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>