[PATCH]Fix aarch64 native build issue caused by use of LONGEST

["Bin.Cheng" <amker.cheng@gmail.com>]

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Hi,
Recent gdb code refactor changes LONGEST from a macro to a typedef,
thus the use of it in aarch64-linux-nat.c is no longer valid.

This patch fixes the build failure which is obvious.  Is it OK?

Thanks,
bin

2014-08-21  Bin Cheng  <bin.cheng@arm.com>

* aarch64-linux-nat.c (dr_changed_t): Change the type from
unsigned LONGEST to ULONGEST.

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diff --git a/gdb/aarch64-linux-nat.c b/gdb/aarch64-linux-nat.c
index 4ae789b..1184197 100644
--- a/gdb/aarch64-linux-nat.c
+++ b/gdb/aarch64-linux-nat.c
@@ -144,7 +144,7 @@ static int debug_hw_points;
    ptrace calls to the kernel, i.e. avoid asking the kernel to write
    to the debug registers with unchanged values.  */
 
-typedef unsigned LONGEST dr_changed_t;
+typedef ULONGEST dr_changed_t;
 
 /* Set each of the lower M bits of X to 1; assert X is wide enough.  */