Add Note to Build Instructions

The first time around the build failed with an "Error 2". I’m not sure why but other people might encounter the same as I currently have a relative vanilla OS X/Homebrew installation. Simply trying again succeeded.
mkeeter · Sep 16, 2015 · 8121972 · 8121972
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commit 8121972
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diff --git a/BUILDING.md b/BUILDING.md
@@ -28,6 +28,7 @@ make -j8
 
 open app/Antimony.app
 ```
+Note: If `make -j8` exits with an "Error 2" just run `make -j8` again to succeed.
 
 Linux
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