Fix for drivers/phidgets for recent versions of automake in debian/ubuntu14.04

drivers/phidgets were unable to build because of:

1. automake complains about "archiver requires 'AM_PROG_AR' in 'configure.ac'" ->
https://lists.gnu.org/archive/html/bug-automake/2012-05/msg00009.html
2. automake 1.14 seems to be more picky about missing files -> resolved by adding the --add-missing option to automake
3. automake --add-missing might then have an impact on selecting autoheader to build the lib, which results in an build error, disabled autoheader manually