[Click] Unresolved symbols in kernel module

[Rafael Laufer]

I was getting unresolved symbols when inserting the click module in the 
2.4 kernel.

linuxmodule/click.o: unresolved symbol htons
linuxmodule/click.o: unresolved symbol ntohl
linuxmodule/click.o: unresolved symbol ntohs

The problem was that the Makefile in the linuxmodule directory was not 
considering the -O2 flag of the CFLAGS macro during compilation for the 
2.4 kernel. For some reason, CFLAGS was not added to the CXXCOMPILE 
macro in linuxmodule/Makefile.in.

The attached patch fixes the problem.

Rafael
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