c99_math: import isinf for uclibc based toolchains
The same fix as for glibc >= 2.23 is needed for uclibc based toolchains.
Signed-off-by: Peter Seiderer ps.report@gmx.net
The same fix as for glibc >= 2.23 is needed for uclibc based toolchains.
Signed-off-by: Peter Seiderer ps.report@gmx.net