libgcc: Fix -Wint-conversion warning in find_fde_tail

Fixes commit r14-1614-g49310a99330849 ("libgcc: Fix eh_frame fast path
in find_fde_tail").

libgcc/

	PR libgcc/110179
	* unwind-dw2-fde-dip.c (find_fde_tail): Add cast to avoid
	implicit conversion of pointer value to integer.

(cherry picked from commit 104b0900)

libgcc/unwind-dw2-fde-dip.c

@@ -403,7 +403,7 @@ find_fde_tail (_Unwind_Ptr pc,
 	 BFD ld generates.  */
       signed value __attribute__ ((mode (SI)));
       memcpy (&value, p, sizeof (value));
-      eh_frame = p + value;
+      eh_frame = (_Unwind_Ptr) (p + value);
       p += sizeof (value);
     }
   else