enable sysinfo support on illumos systems

Support for illumos systems was added to the sys-info crate some time
ago, and was working with effective-limits, but as of 887a5a0
appears to have effectively been turned off at build time.

Cargo.toml

@@ -17,7 +17,7 @@ license = "Apache-2.0"
 cfg-if="0.1.10"
 thiserror = "1.0.20"
 
-[target.'cfg(any(windows, target_os="macos", target_os="linux", target_os="freebsd"))'.dependencies]
+[target.'cfg(any(windows, target_os="macos", target_os="linux", target_os="freebsd", target_os="illumos", target_os="solaris"))'.dependencies]
 sys-info = "0.7.0"
 
 [target.'cfg(unix)'.dependencies]

src/lib.rs

@@ -11,6 +11,8 @@ cfg_if! {
                  target_os="macos",
                  target_os="linux",
                  target_os="freebsd",
+                 target_os="illumos",
+                 target_os="solaris",
                 ))] {
         #[derive(thiserror::Error, Debug)]
         pub enum Error {
@@ -160,6 +162,8 @@ pub fn memory_limit() -> Result<u64> {
                      target_os="macos",
                      target_os="linux",
                      target_os="freebsd",
+                     target_os="illumos",
+                     target_os="solaris",
                     ))] {
             let info = sys_info::mem_info()?;
             let total_ram = info.total * 1024;