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>
---
Changes v1 -> v2:
  - add defined() around __UCLIBC__
43 jobs for !4042 with ps-devel-fix-isinf-001 in 16 minutes and 16 seconds (queued for 4 seconds)
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