Set endianess for or1k

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>

diff -Nur classpath-0.98.orig/native/fdlibm/ieeefp.h classpath-0.98/native/fdlibm/ieeefp.h
--- classpath-0.98.orig/native/fdlibm/ieeefp.h	2008-01-13 18:33:50.000000000 +0100
+++ classpath-0.98/native/fdlibm/ieeefp.h	2017-02-26 12:39:12.316327363 +0100
@@ -123,6 +123,10 @@
 #define __IEEE_BIG_ENDIAN
 #endif
 
+#ifdef __or1k__
+#define __IEEE_BIG_ENDIAN
+#endif
+
 #ifdef __v800
 #define __IEEE_LITTLE_ENDIAN
 #endif