Expunge #ifdef and #ifndef from the codebase

These are unexploded minds as far as the linter is concerned. I don't
want to hit in my MRs by mistake!

I did this with `sed`, and then rolled back some changes in the docs,
config.guess, and the linter itself.

3 files changed, 8 insertions, 8 deletions

diff --git a/libraries/base/System/Environment/Blank.hsc b/libraries/base/System/Environment/Blank.hsc
index 637a039809..02d369b5d6 100644
--- a/libraries/base/System/Environment/Blank.hsc
+++ b/libraries/base/System/Environment/Blank.hsc
@@ -40,7 +40,7 @@ module System.Environment.Blank
   ) where
 
 import Foreign.C
-#ifdef mingw32_HOST_OS
+#if defined(mingw32_HOST_OS)
 import Foreign.Ptr
 import GHC.Windows
 import Control.Monad
@@ -61,7 +61,7 @@ import System.Environment
       withProgName,
       getEnvironment
   )
-#ifndef mingw32_HOST_OS
+#if !defined(mingw32_HOST_OS)
 import qualified System.Environment as Environment
 #endif
 
@@ -85,7 +85,7 @@ throwInvalidArgument from =
 
 -- | Similar to 'System.Environment.lookupEnv'.
 getEnv :: String -> IO (Maybe String)
-#ifdef mingw32_HOST_OS
+#if defined(mingw32_HOST_OS)
 getEnv = (<$> getEnvironment) . lookup
 #else
 getEnv = Environment.lookupEnv
diff --git a/libraries/base/tests/IO/T12010/T12010.hsc b/libraries/base/tests/IO/T12010/T12010.hsc
index e13a5fe5c7..9bcb92ef83 100644
--- a/libraries/base/tests/IO/T12010/T12010.hsc
+++ b/libraries/base/tests/IO/T12010/T12010.hsc
@@ -7,7 +7,7 @@ import Foreign.Marshal.Alloc
 import GHC.IO.FD
 import System.Exit
 
-#ifdef _WIN32
+#if defined(_WIN32)
 #include <winsock.h>
 #else
 #include <sys/socket.h>
@@ -21,7 +21,7 @@ sOCK_STREAM = #const SOCK_STREAM
 
 main :: IO ()
 main = do
-#ifdef _WIN32
+#if defined(_WIN32)
   void $ initWinSock
 #endif
   sock <- c_socket aF_INET sOCK_STREAM 0
@@ -34,6 +34,6 @@ main = do
 foreign import stdcall unsafe "socket"
   c_socket :: CInt -> CInt -> CInt -> IO CInt
 
-#ifdef _WIN32
+#if defined(_WIN32)
 foreign import ccall unsafe "initWinSock" initWinSock :: IO Int
 #endif
diff --git a/libraries/libiserv/src/GHCi/Utils.hsc b/libraries/libiserv/src/GHCi/Utils.hsc
index b90cfacb5f..f606eb9d94 100644
--- a/libraries/libiserv/src/GHCi/Utils.hsc
+++ b/libraries/libiserv/src/GHCi/Utils.hsc
@@ -5,7 +5,7 @@ module GHCi.Utils
 
 import Foreign.C
 import GHC.IO.Handle (Handle())
-#ifdef mingw32_HOST_OS
+#if defined(mingw32_HOST_OS)
 import GHC.IO.Handle.FD (fdToHandle)
 #else
 import System.Posix
@@ -15,7 +15,7 @@ import System.Posix
 
 -- | Gets a GHC Handle File description from the given OS Handle or POSIX fd.
 getGhcHandle :: CInt -> IO Handle
-#ifdef mingw32_HOST_OS
+#if defined(mingw32_HOST_OS)
 getGhcHandle handle = _open_osfhandle handle (#const _O_BINARY) >>= fdToHandle
 
 foreign import ccall "io.h _open_osfhandle" _open_osfhandle ::