uwsgiconfig: restore obsolete linux check on ia64

Fix #397
Add proper ifdefery for namespaces on ia64

Fix #398
added sendfile support to raw mode
try specified rvm paths first
Merge pull request #402 from xrmx/ia64

Ia64 fixes
honour --force-cwd
chdir at every emperor glob interaction
fixed #405
fixed #405
fixed regression in --set as a workaround for broken getopt_long
fixed #406
added UWSGI_EMBED_CONFIG variable
added --set-placeholder/--set-ph
added magic vars for original config file
do not set upper magic vars in --inherit or --include mode
fixed #407
fixed #409
various consistency fixes for strict mode + autoload
more consistent placeholders support
fixed #409