[dev] sbase patch

i have packaged sandy, sbase, sxiv and other suckless packages in slpm
(http://hg.youterm.com/slpm) you can build chroots with it or install
packages without shitting the system.

I'm attaching a patch that fixes the make to use ${CC} instead of musl
if $CC environ is defined, musl is not yet available on all systems, so
we should honor those environment variables.

the patch also adds the 'install' target.

have fun

--pancake