The PythonTest_dbacces_python in a clang ASAN build on F21 started to
fail with StackOverflowError in JNI_CreateJavaVM on the main thread,
and this fixes the problem.

Seen with java-1.8.0-openjdk-1.8.0.45-39.b14.fc21.x86_64

Change-Id: I87dfb4b62d547b334c19261aad88b4856489776f