[gabi++] Fix bug: incorrect parameter type.

To be compatible with lower-level library API, the second parameter
type of _Unwind_SetIP should not be uint64_t, or it will
occur type casting error, which causes stack unwinding fail on Mips.

After this commit, I believe we can claim that
stlport w/ gabi++ has good support on exception handling
on all ARM, x86 and Mips platforms.

Change-Id: Ic338c8f8a74a5921bd23187450af315d69c817ed
diff --git a/sources/cxx-stl/gabi++/include/unwind-itanium.h b/sources/cxx-stl/gabi++/include/unwind-itanium.h
index 5effb27..bd7a4b2 100644
--- a/sources/cxx-stl/gabi++/include/unwind-itanium.h
+++ b/sources/cxx-stl/gabi++/include/unwind-itanium.h
@@ -80,7 +80,7 @@
 void _Unwind_SetGR(struct _Unwind_Context*, int index, uint64_t new_value);
 
 uint64_t _Unwind_GetIP(struct _Unwind_Context*);
-void _Unwind_SetIP(struct _Unwind_Context*, uint64_t new_value);
+void _Unwind_SetIP(struct _Unwind_Context*, uintptr_t new_value);
 
 uint64_t _Unwind_GetRegionStart(struct _Unwind_Context*);
 uint64_t _Unwind_GetLanguageSpecificData(struct _Unwind_Context*);