fix: make nix build on Illumos (#2694)

* Illumos patches

* changelog

* Disable mod sys/resource on Solaris

Looks like Solaris does not have them according to our CI [1]

[1]: https://github.com/nix-rust/nix/actions/runs/19349070659/job/55356544189?pr=2694

---------

Co-authored-by: Steve Lau <stevelauc@outlook.com>

Author: extrowerk

changelog/2694.fixed.md

@@ -0,0 +1 @@
+Fix the build on Illumos

src/sys/mod.rs

@@ -96,7 +96,7 @@ feature! {
 #[cfg(not(any(
     target_os = "redox",
     target_os = "fuchsia",
-    solarish,
+    target_os = "solaris",
     target_os = "haiku"
 )))]
 feature! {

src/sys/resource.rs

@@ -19,6 +19,7 @@ cfg_if! {
         bsd,
         target_os = "android",
         target_os = "aix",
+        target_os = "illumos",
         all(target_os = "linux", not(target_env = "gnu")),
         target_os = "cygwin"
     ))]{
@@ -50,6 +51,7 @@ libc_enum! {
             bsd,
             target_os = "android",
             target_os = "aix",
+            target_os = "illumos",
             all(target_os = "linux", not(any(target_env = "gnu", target_env = "uclibc"))),
             target_os = "cygwin"
         ), repr(i32))]