Add missing assert.h include

Bug: http://b/175635923
Test: treehugger
Change-Id: Ic0b085116c21ac35720f0558b1ba0b57a41b0f84
diff --git a/linker/linker.cpp b/linker/linker.cpp
index 5c26944..1553ba9 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -27,6 +27,7 @@
  */
 
 #include <android/api-level.h>
+#include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>