devel/cargo modules will take care of some aspects of crate dependencies on
system/ports libraries
adapt some ports depending on devel/cargo to properly link to ports libraries,
and to not patch anymore what it is now done by devel/cargo (openssl-sys crate
for example)
with help and ok @sthem
The new syntax to have version with '-' character:
-MODCARGO_CRATES += aho-corasick-0.6.8 # Unlicense/MIT
+MODCARGO_CRATES += aho-corasick 0.6.8 # Unlicense/MIT
update all customers of devel/cargo to use the new syntax
ok landry@