packages/lm-sensors: fix compilation with musl

Fixes:
http://autobuild.buildroot.net/results/f72/f72ae17cea910a1dbd3d5d4d09cfbc90d9ba8dc0/



Imports a patch from Alpine Linux to remove __GLIBC__ conditional
compilation. Retested with both musl, glibc and uclibc.

Patch accepted upstream.

Signed-off-by: Brendan Heading <brendanheading@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>