Improve brp-compress performance. JB#63057

[direc85]

brp-compress executed find twice for every folder in the man structure, which meant for filesystem package it was executed 30100 times (!!) without a single manpage to be found. I reworked the script so that it calls find two times, but with a long list of folders as parameters instead. This took the overall build time of filesystem on my laptop from ~185 seconds to ~60 seconds, dropping brp-compress execution time from two minutes to roughly a second.

I tested the docs build result with rpm-doc package, which resulted in same size and same contents with the old and new script.

While at it, I fixed the messy whitespace usage in brp-compress, cleaned up the code a little, removed uses of egrep and fixed the project to compile with Platform SDK too.

[Thaodan]

You can replace this with one find |read loop like this:

MANDIR=...

find $MANDIRS -type f  | while read -r  manfile

...

done 

Using find with read eliminates both issues no need to deal with globbing issues in the ls and find statement or the need to call exit.

If no manuals are found the while loop won't run at all and the script exists.

[Thaodan]

You don't need this you can skip this as mentioned earlier.