File boost-aarch64-flags.patch of Package boost-legacy

Index: boost_1_58_0/tools/build/src/tools/gcc.jam
===================================================================
--- boost_1_58_0.orig/tools/build/src/tools/gcc.jam
+++ boost_1_58_0/tools/build/src/tools/gcc.jam
@@ -457,10 +457,6 @@ rule setup-address-model ( targets * : s
                 {
                     option = -m32 ;
                 }
-                else if $(model) = 64
-                {
-                    option = -m64 ;
-                }
             }
             # For darwin, the model can be 32_64. darwin.jam will handle that
             # on its own.