From: hololeap <hololeap@protonmail.com>
Signed-off-by: hololeap <hololeap@protonmail.com>

Add 'examples' USE flag and rename the example executable from 'greet' to
'servant-server-example'.

diff -urN servant-server-0.18.3/servant-server.cabal servant-server-0.18.3-r1/servant-server.cabal
--- servant-server-0.18.3/servant-server.cabal	2022-02-11 02:33:28.463223367 -0700
+++ servant-server-0.18.3-r1/servant-server.cabal	2022-02-11 02:35:38.242984376 -0700
@@ -33,6 +33,10 @@
   type: git
   location: http://github.com/haskell-servant/servant.git
 
+flag examples
+  description: Build the servant-server-example executable
+  default: False
+
 library
   exposed-modules:
     Servant
@@ -99,7 +103,9 @@
 
   ghc-options: -Wall -Wno-redundant-constraints
 
-executable greet
+executable servant-server-example
+  if !flag(examples)
+    buildable: False
   main-is: greet.hs
   hs-source-dirs: example
   ghc-options: -Wall