fixed issue with multiple modules compilation.
now voc adds dependency modules object files to the main module
compiling command line.
for example, if MM0 imports MM1 then if we call voc like:
voc -l MM1.Mod -s MM0.Mod -M

 the commandline will look like

cc  MM0.c MM1.o -static  -o MM0  -fPIC -g -I /opt/voc-1.0/src/lib/system/gnuc/x86_64  -I /opt/voc-1.0/lib/voc/obj -lVishapOberon -L. -L/opt/voc-1.0/lib