make sure flatcc-native builds for proper arch

Author: mariotaku

fbs/CMakeLists.txt

@@ -11,9 +11,11 @@ ExternalProject_Add(flatcc-native
         URL_HASH SHA512=46ba5ca75facc7d3360dba797d24ae7bfe539a854a48831e1c7b96528cf9594d8bea22b267678fd7c6d742b6636d9e52930987119b4c6b2e38d4abe89b990cae
         DOWNLOAD_EXTRACT_TIMESTAMP TRUE
         CMAKE_ARGS
+        -DCMAKE_C_COMPILER=/usr/bin/cc
         -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
         -DBUILD_SHARED_LIBS=OFF
         -DCMAKE_INSTALL_PREFIX=${CMAKE_CURRENT_BINARY_DIR}/native
+        -UCMAKE_TOOLCHAIN_FILE
         -DFLATCC_TEST=OFF
         -DFLATCC_INSTALL=ON
         BUILD_BYPRODUCTS ${FLATCC_EXECUTABLE}