Auto merge of #148669 - wesleywiser:function_sections_gnu_cygwin, r=<try>

Enable `-Zfunction-sections` by default for `*-windows-{gnu,cygwin}`

try-job: x86_64-mingw-1
try-job: x86_64-mingw-2

Author: rust-bors[bot]

compiler/rustc_target/src/spec/base/cygwin.rs

@@ -26,8 +26,6 @@ pub(crate) fn opts() -> TargetOptions {
     TargetOptions {
         os: "cygwin".into(),
         vendor: "pc".into(),
-        // FIXME(#13846) this should be enabled for cygwin
-        function_sections: false,
         linker: Some("gcc".into()),
         dynamic_linking: true,
         dll_prefix: "".into(),

compiler/rustc_target/src/spec/base/windows_gnu.rs

@@ -80,8 +80,6 @@ pub(crate) fn opts() -> TargetOptions {
         os: "windows".into(),
         env: "gnu".into(),
         vendor: "pc".into(),
-        // FIXME(#13846) this should be enabled for windows
-        function_sections: false,
         linker: Some("gcc".into()),
         dynamic_linking: true,
         dll_tls_export: false,