core: Update to commit d84caf0.

mupen64plus/mupen64plus-core@d84caf0

*   d84caf0 Merge pull request #123 from Gillou68310/textrel
|\
| * d0aa600 new_dynarec: Cleanup linkage_arm.S
| * 17ae404 Avoid .text relocations in PIC shared library
|/
* 87b9b57 Revert "Avoid .text relocations in PIC shared library", because according to Gillou68310 this change causes crash at start of Conker's BFD on android.
* 86a8673 Merge pull request #122 from bentley/openbsd
* f62e8f8 OpenBSD has had good support for mupen64plus for multiple releases now.

jni/mupen64plus-core/projects/unix/Makefile

@@ -42,7 +42,6 @@ endif
 ifeq ("$(UNAME)","OpenBSD")
   OS = FREEBSD
   CFLAGS += -DIOAPI_NO_64
-  $(warning OS type "$(UNAME)" not officially supported.')
 endif
 ifneq ("$(filter GNU/kFreeBSD kfreebsd,$(UNAME))","")
   OS = LINUX