dahdi-tools: use default Build/Compile template

dahdi-tools: use default Build/Compile template

Add two patches to fix general compile issues. The first masks out some
glibc specific extensions if using a different libc.

The second fixes a compile issue with newer compilers.

Like this it's possible to easily add more executables to the packages
should the need (or wish) arise. This also gets rid of the following
warnings:

cc1: note: someone does not honour COPTS correctly, passed 2 times

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>