Remove second -Wno-deprecated-copy.

Author: pmienk

configure.ac

@@ -257,12 +257,6 @@ AS_CASE([${CC}], [*],
     [AX_CHECK_COMPILE_FLAG([-Wno-comment],
         [CXXFLAGS="$CXXFLAGS -Wno-comment"])])
 
-# Suppress warning for copy of implicitly generated copy constructor.
-#------------------------------------------------------------------------------
-AS_CASE([${CC}], [*],
-    [AX_CHECK_COMPILE_FLAG([-Wno-deprecated-copy],
-        [CFLAGS="$CFLAGS -Wno-deprecated-copy"])])
-
 # Suppress warning for copy of implicitly generated copy constructor.
 #------------------------------------------------------------------------------
 AS_CASE([${CC}], [*],