allow core:mem/virtual import on more targets by expanding the other implementation

core/mem/virtual/virtual_other.odin

@@ -0,0 +1,30 @@
+//+private
+//+build !darwin
+//+build !linux
+//+build !windows
+package mem_virtual
+
+_reserve :: proc "contextless" (size: uint) -> (data: []byte, err: Allocator_Error) {
+	return nil, nil
+}
+
+_commit :: proc "contextless" (data: rawptr, size: uint) -> Allocator_Error {
+	return nil
+}
+
+_decommit :: proc "contextless" (data: rawptr, size: uint) {
+}
+
+_release :: proc "contextless" (data: rawptr, size: uint) {
+}
+
+_protect :: proc "contextless" (data: rawptr, size: uint, flags: Protect_Flags) -> bool {
+	return false
+}
+
+_platform_memory_init :: proc() {
+}
+
+_map_file :: proc "contextless" (fd: uintptr, size: i64, flags: Map_File_Flags) -> (data: []byte, error: Map_File_Error) {
+	return nil, .Map_Failure
+}