Fix MinGW suffix configuration.

In the driver-vpi file we need to use g for the suffix replacement
so that both libraries get changed.

Also added an end line to the config.h.in file.

driver-vpi/Makefile.in

@@ -69,7 +69,7 @@ main.o: main.c config.h
 
 config.h: config.h.in
 	sed -e 's;@IVLCC@;@CC@;' -e 's;@IVLCXX@;@CXX@;' \
-	    -e 's;@SUFFIX@;$(suffix);' \
+	    -e 's;@SUFFIX@;$(suffix);g' \
 	    -e 's;@IVLCFLAGS@;@CXXFLAGS@;' \
 	    -e 's;@SHARED@;@shared@;' $< > $@