[Ada] GNAT.Binary_Search is not internal

[Pierre-Marie de Rodat via Gcc-patches]

Put package GNAT.Binary_Search to predefined units list.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * impunit.adb: Add "g-binsea" to Non_Imp_File_Names_95 list.
diff --git a/gcc/ada/impunit.adb b/gcc/ada/impunit.adb
--- a/gcc/ada/impunit.adb
+++ b/gcc/ada/impunit.adb
@@ -241,6 +241,7 @@ package body Impunit is
     ("g-arrspl", F),  -- GNAT.Array_Split
     ("g-awk   ", F),  -- GNAT.AWK
     ("g-binenv", F),  -- GNAT.Bind_Environment
+    ("g-binsea", F),  -- GNAT.Binary_Search
     ("g-boubuf", F),  -- GNAT.Bounded_Buffers
     ("g-boumai", F),  -- GNAT.Bounded_Mailboxes
     ("g-brapre", F),  -- GNAT.Branch_Prediction