Add 32-bit objdiff-cli build

Author: roblabla

.github/workflows/build.yaml

@@ -142,6 +142,11 @@ jobs:
             name: linux-armv7l
             build: zigbuild
             features: default
+          - platform: windows-latest
+            target: i586-pc-windows-msvc
+            name: windows-x86
+            build: build
+            features: default
           - platform: windows-latest
             target: x86_64-pc-windows-msvc
             name: windows-x86_64