Add Rust Gnu x86 (#3166)

manifests/Rustlang/rust-gnu-x86/1.45.2.yaml

@@ -0,0 +1,18 @@
+Id: Rustlang.rust-gnu-x86
+Version: 1.45.2
+Name: rust-gnu
+Publisher: Rustlang
+License: Apache 2.0 and MIT
+LicenseUrl: https://raw.githubusercontent.com/rust-lang/rust/master/COPYRIGHT
+AppMoniker: rust-gnu
+Tags: rust, windows, gnu
+Description: this is the rust-lang built with gnu toolchain
+Homepage: https://www.rust-lang.org/
+Installers:
+  - Arch: x86
+    Url: https://static.rust-lang.org/dist/rust-1.45.2-i686-pc-windows-gnu.msi
+    Sha256: 907D595E1408AD35F7EC18439DD783EF02BB7015F1A67DDC379632A2309999ED
+    InstallerType: msi
+    Switches:
+      Silent: "/quiet"
+      SilentWithProgress: "/quiet /passive"