Fix linker issues on different Windows architectures.

.gitignore

@@ -2,6 +2,7 @@
 *.o
 *.a
 *.so
+*.syso
 
 # Folders
 _obj

rsrc_windows_386.go

@@ -1,5 +1,5 @@
-//+build windows
+// +build windows,386
 
 package main
 
-//go:generate goversioninfo -manifest "rsrc/app.manifest" -icon "rsrc/app.ico" -o "rsrc_windows.syso"
+//go:generate goversioninfo -manifest "rsrc/app.manifest" -icon "rsrc/app.ico" -o "rsrc_windows.syso" -arch 386

rsrc_windows_amd64.go

@@ -0,0 +1,5 @@
+// +build windows,amd64
+
+package main
+
+//go:generate goversioninfo -manifest "rsrc/app.manifest" -icon "rsrc/app.ico" -o "rsrc_windows.syso" -arch amd64