Fix CMAKE_SYSTEM_PROCESSOR for aarch64 compilers (#75)

It needs to be aarch64, since that's what uname -m prints on those systems.

Author: Gold856

makes/src/91-cmake-cfg.sh

@@ -24,9 +24,12 @@ mkdir -p "${BUILD_DIR}/cmake-install/${WPI_HOST_PREFIX}"
 xcd "${BUILD_DIR}/cmake-install/${WPI_HOST_PREFIX}"
 
 case "${TARGET_TUPLE}" in
-arm* | aarch64*)
+arm*)
     PROCESSOR=arm
     ;;
+aarch64*)
+    PROCESSOR=aarch64
+    ;;
 x86_64*)
     PROCESSOR=AMD64
     ;;