toolchain: update paranoid unsafe path comment

Since 919c06c28295f19ca49459b98d8954148b381360 the calls to gcc always pass
through the toolchain wrapper and all gcc patches to support poisoning has been
removed.

Update the BR2_COMPILER_PARANOID_UNSAFE_PATH comment.

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Config.in

@@ -694,8 +694,8 @@ config BR2_COMPILER_PARANOID_UNSAFE_PATH
 	  unsafe paths are encountered.
 
 	  Note that this mechanism is available for both the internal
-	  toolchain (through gcc and binutils patches) and external
-	  toolchain backends (through the external toolchain wrapper).
+	  toolchain (through the toolchain wrapper and binutils patches)
+	  and external toolchain backends (through the toolchain wrapper).
 
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