--solc-args is broken on single argument

[montyly]

For example

crytic-compile file.sol --solc-args "--optimize"

will fail, while

crytic-compile file.sol --solc-args "optimize"

works.

But if multiple args are provided the -- is required for every argument:

crytic-compile file.sol --solc-args "--optimize --optimize-runs 100"

[duckki]

Hmm, the situation changed a bit (as of 0.3.0). This doesn't work (any more):

crytic-compile file.sol --solc-args optimize

But, this works:

crytic-compile file.sol --solc-args=--optimize