use 8 instead

Closes #45.

Signed-off-by: Bugen Zhao <[email protected]>

Author: BugenZhao

Formula/risingwave.rb

@@ -99,7 +99,7 @@ def install
 
  [profile.production]
  inherits = "release"
-+codegen-units = 1 # mitigate "argument list too long" error when linking
++codegen-units = 8 # mitigate "argument list too long" error when linking
  incremental = false
  lto = "thin"