Removed recently added .la file in packages

http://wiki.debian.org/ReleaseGoals/LAFileRemoval

debian/libmodbus-dev.install

@@ -1,4 +1,3 @@
 debian/tmp/usr/include/modbus/*
-debian/tmp/usr/lib/libmodbus.la
 debian/tmp/usr/lib/libmodbus.so
 debian/tmp/usr/lib/pkgconfig/libmodbus.pc

libmodbus.spec.in

@@ -69,7 +69,6 @@ make %{?_smp_mflags}
 %{_includedir}/modbus/modbus-version.h
 %dir %{_libdir}/libmodbus.so
 
-%{_libdir}/libmodbus.la
 %{_libdir}/pkgconfig/libmodbus.pc
 %{_libdir}/libmodbus.so