xcode: fix invalid range in comparison

Due to a typo, the range of LLVM build versions 2066 to 2325 were never
matched and thus Xcode 3.2.0 could never be inferred from that. (Only
relevant for legacy systems. Doesn't seem to have impacted any users.)

Library/Homebrew/os/mac/xcode.rb

@@ -103,7 +103,7 @@ module OS
         case MacOS.llvm_build_version.to_i
         when 1..2063 then "3.1.0"
         when 2064..2065 then "3.1.4"
-        when 2366..2325
+        when 2066..2325
           # we have no data for this range so we are guessing
           "3.2.0"
         when 2326