Fix file importing code to not generate some duplicate directories

build_file_tree() depends on the fact that the contents of a directory
are sorted immediately after it in the file list, but '.' sorts before '/'
lexicographically, so you'd actually end up with, eg:

/etc/yum
/etc/yum.conf
/etc/yum/pluginconf.d

which would cause a second entry for /etc/yum to be added to the file
list.

For now I've fixed this by make compare_filenames() do a special strcmp
by hand, manually sorting '/' before anything else.

 CFLAGS = -Wall -g

 LDLIBS = -lexpat -lz -g -lrpm -lcurl

 all : razor test-driver

 razor : razor.o yum.o main.o rpm.o types.o util.o

 *.o : razor.h razor-internal.h

 razor.o : types.h

 test-driver : razor.o types.o util.o test-driver.o

 test : test-driver

 	./test-driver test.xml

 clean :

 	rm -f *.o razor