fixup! Remove BinaryBuilder and fix tests on nightly

Author: JamesWrigley

test/test_bitfield.jl

@@ -14,7 +14,7 @@ function build_libbitfield_native()
             if Sys.iswindows()
                 config_cmd = `$config_cmd -A win32`
             elseif Sys.islinux()
-                config_cmd = `$config_cmd -D CMAKE_C_FLAGS=-march=native -D CMAKE_CXX_FLAGS=-march=native`
+                config_cmd = `$config_cmd -D CMAKE_C_FLAGS='-m32 -march=native'`
             end
         end
         build_cmd = `$(cmake()) --build $build_dir --config Debug`