fix aarch64 for gcc

Author: Vixea

boulder/data/macros/arch/aarch64.yaml

@@ -5,9 +5,9 @@ definitions:
     - libsuffix      : ""
     - build_platform : aarch64-%(vendorID)
     - host_platform  : aarch64-%(vendorID)
-    - cc             : "%(compiler_c) -m64"
-    - cxx            : "%(compiler_cxx) -m64"
-    - cpp            : "%(compiler_cpp) -m64"
+    - cc             : "%(compiler_c)"
+    - cxx            : "%(compiler_cxx)"
+    - cpp            : "%(compiler_cpp)"
     - march          : armv8-a+simd+fp+crypto
     - mtune          : cortex-a72.cortex-a53
     - target_triple  : "aarch64-unknown-linux-gnu"