Allow to change static_libs for variant

This will be used to have different static_libs if we build with scudo.

Bug: 309446525
Change-Id: I5f755dd768975a1dff403bffa92cd5dbc3b9f573
diff --git a/android/variable.go b/android/variable.go
index 9844080..74d1145 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -73,6 +73,7 @@
 			Cflags              []string `android:"arch_variant"`
 			Shared_libs         []string `android:"arch_variant"`
 			Whole_static_libs   []string `android:"arch_variant"`
+			Static_libs         []string `android:"arch_variant"`
 			Exclude_static_libs []string `android:"arch_variant"`
 			Srcs                []string `android:"arch_variant"`
 			Header_libs         []string `android:"arch_variant"`