Remove unnecessary jni.h

Discovered after removing implicit jni.h include path.

Bug: 152482542
Test: lunch aosp_x86_64 && m checkbuild
Change-Id: I5fcb33b110c8f5ee9db3c910eaaa3e6018979a45
diff --git a/tests/libs/segment_gap_outer.cpp b/tests/libs/segment_gap_outer.cpp
index fb448e7..18aa3ee 100644
--- a/tests/libs/segment_gap_outer.cpp
+++ b/tests/libs/segment_gap_outer.cpp
@@ -1,6 +1,5 @@
 #include <android/dlext.h>
 #include <dlfcn.h>
-#include <jni.h>
 #include <stdlib.h>
 
 extern "C" void text_before_start_of_gap() {}