AK: Make it possible to not `using` AK classes into the global namespace

This patch adds the `USING_AK_GLOBALLY` macro which is enabled by
default, but can be overridden by build flags.

This is a step towards integrating Jakt and AK types.

1 files changed, 2 insertions, 0 deletions

diff --git a/AK/Math.h b/AK/Math.h
index 609e53d3fb..247bafbe65 100644
--- a/AK/Math.h
+++ b/AK/Math.h
@@ -775,4 +775,6 @@ constexpr T ceil(T num)
 #undef AARCH64_INSTRUCTION
 }
 
+#if USING_AK_GLOBALLY
 using AK::round_to;
+#endif