superiotool: Allow to override Makefile variables `CC`, `INSTALL` and `PREFIX`
treee1086da4ed0cd84c045c1895c9ff1ea350210e39
-rw-r--r-- 1808 .gitignore
-rw-r--r-- 89 .gitmodules
-rw-r--r-- 83 .gitreview
m--------- - 3rdparty
-rw-r--r-- 17987 COPYING
-rw-r--r-- 9667 Makefile
-rw-r--r-- 15881 Makefile.inc
-rw-r--r-- 2998 README
drwxr-xr-x - documentation
drwxr-xr-x - payloads
drwxr-xr-x - src
drwxr-xr-x - util