Add missing includes.

Test: mma
Bug: None
Change-Id: I0221b213e08d07cc5ac0b704a86e98ae8c0f456f
diff --git a/linker/linker_allocator.h b/linker/linker_allocator.h
index 9c16828..7fc6cbf 100644
--- a/linker/linker_allocator.h
+++ b/linker/linker_allocator.h
@@ -29,6 +29,7 @@
 #ifndef __LINKER_ALLOCATOR_H
 #define __LINKER_ALLOCATOR_H
 
+#include <errno.h>
 #include <stdlib.h>
 #include <sys/cdefs.h>
 #include <sys/mman.h>