Remove tests for the i586-pc-windows-msvc target

Since [1], this target no longer exists so we need to remove it from CI.

[1]: rust-lang/rust#137957

(backport <#4311>)
(cherry picked from commit 33c320a)

Author: tgross35

Cargo.toml

@@ -50,7 +50,6 @@ targets = [
     "armv7r-none-eabihf",
     # FIXME(hexagon): excluded due to duplicate symbol errors
     # "hexagon-unknown-linux-musl",
-    "i586-pc-windows-msvc",
     "i586-unknown-linux-gnu",
     "i586-unknown-linux-musl",
     "i686-linux-android",

ci/verify-build.sh

@@ -192,7 +192,6 @@ armebv7r-none-eabihf \
 armv7-wrs-vxworks-eabihf \
 armv7r-none-eabi \
 armv7r-none-eabihf \
-i586-pc-windows-msvc \
 i686-pc-windows-msvc \
 i686-unknown-haiku \
 i686-unknown-netbsd \