fixed handling of dependent patches.

in order to run prepare-source.

message and change the prompt.

the patches directory in a separate tar file.

one or more patches/*.diff files.

extraneous extern in exclude.c.

for a build.  It pretends to be a configure script so that the build
steps are still the normal sequence of ./configure, make, make install
(which is particularly helpful with the samba build farm).  Once the
generated files are ready, the configure.sh script is called to do the
real configure work.

before fetching them.

while still supporting the samba build farm.  Let's see if it works.

last line of the verbose summary text.

don't have it.

particular, make it clear that --dry-run turns off action without
turning on verbosity, and has some incomplete/inaccurate stats.

was disabled via configure.