lib/Makefile.am: Add 'comedi_la_LIBADD = -lm'
lib/Makefile.am: Add 'comedi_la_LIBADD = -lm'

Builds on some systems need the line:

comedi_la_LIBADD = -lm

in lib/Makefile.am

Reported by Jan Banda, using a Linux Mint Petra system with gcc version
4.8.1.

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