removed bitrig support (#3608)

bitrig support has been removed (by me) in rust-lang/rust#60775

Author: hellow554

tests/source/attrib.rs

@@ -202,7 +202,7 @@ pub struct Params {
                   target_os = "cloudabi",
                   target_os = "macos", target_os = "ios",
                   target_os = "freebsd",
-                  target_os = "openbsd", target_os = "bitrig",
+                  target_os = "openbsd",
                   target_os = "redox",
                   target_os = "fuchsia",
                   windows,

tests/source/doc-attrib.rs

@@ -81,7 +81,7 @@ pub struct Params {
                   target_os = "cloudabi",
                   target_os = "macos", target_os = "ios",
                   target_os = "freebsd",
-                  target_os = "openbsd", target_os = "bitrig",
+                  target_os = "openbsd",
                   target_os = "redox",
                   target_os = "fuchsia",
                   windows,

tests/source/issue-3343.rs

@@ -37,7 +37,6 @@ use total_len_is_::_51______;
         target_os = "ios",
         target_os = "freebsd",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "redox",
         target_os = "fuchsia",
         windows,

tests/target/attrib.rs

@@ -236,7 +236,6 @@ mod issue_2620 {
         target_os = "ios",
         target_os = "freebsd",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "redox",
         target_os = "fuchsia",
         windows,

tests/target/doc-attrib.rs

@@ -94,7 +94,6 @@ mod issue_2620 {
         target_os = "ios",
         target_os = "freebsd",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "redox",
         target_os = "fuchsia",
         windows,

tests/target/issue-3343.rs

@@ -34,7 +34,6 @@ use total_len_is_::_51______;
         target_os = "ios",
         target_os = "freebsd",
         target_os = "openbsd",
-        target_os = "bitrig",
         target_os = "redox",
         target_os = "fuchsia",
         windows,