[PATCH 0/2] btrfs-progs: standardize utility filenames and add default rules to Makefile

[Eric Sandeen <sandeen@redhat.com>]

2 patches here.

The first renames the single .c files which are built into btrfs-$FOO
commands - previously we built i.e. btrfs-calc-size from calc-size.c

IMHO this helps separate out which files are main command-type
files, and which are not.  (Eventually I hope to move things
into subdirs to organize a bit more).

Then, after renaming i.e. calc-size.c to  btrfs-calc-size.c we can
write a simpler default rule for these utilities (patch 2/2).

The default static rule is handy because it'll automatically build
i.e. "make btrfs-image.static" or "make btrfs-calc-size.static"
if you need them.

I think this is a net win, with a bit less Makefile code
duplication, but if people don't like it, no big deal.  I was hoping
to clean up & re-organize the userspace build a little, and this
seems like a decent first step along the way.

Comments welcome, especially from people who are better at Make than
I am.  ;)  And if this is two clever by half I'm not wedded to it.

-Eric