(gcj_jni_compile_c_to_so):  Fix so extension to '.dll' on win32.
	* testsuite/lib/libjava.exp (libjava_init):  Likewise.
	* testsuite/libjava.jni/jni.exp
	(gcj_jni_compile_c_to_so):  Likewise.
	(gcj_jni_test_one):  Likewise.

From-SVN: r146896