pkg-config-wrapper: Move comments outside of strings

This is much better because then we can freely keep the comments up to
date without causing mass rebuilds.

Someday, somebody should make the same change with `cc-wrapper` and
`bintools-wrapper`.

pkgs/build-support/pkg-config-wrapper/default.nix

@@ -86,22 +86,20 @@ stdenv.mkDerivation {
   ];
 
   postFixup =
+    ##
+    ## User env support
+    ##
+
+    # Propagate the underling unwrapped pkg-config so that if you
+    # install the wrapper, you get anything else it might provide.
     ''
-
-      ##
-      ## User env support
-      ##
-
-      # Propagate the underling unwrapped pkg-config so that if you
-      # install the wrapper, you get anything else it might provide.
       printWords ${pkg-config} > $out/nix-support/propagated-user-env-packages
     ''
 
+    ##
+    ## Man page and doc support
+    ##
     + optionalString propagateDoc (''
-      ##
-      ## Man page and doc support
-      ##
-
       ln -s ${pkg-config.man} $man
     '' + optionalString (pkg-config ? doc) ''
       ln -s ${pkg-config.doc} $doc
@@ -110,12 +108,11 @@ stdenv.mkDerivation {
     + ''
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
       substituteAll ${../wrapper-common/utils.bash} $out/nix-support/utils.bash
-
-      ##
-      ## Extra custom steps
-      ##
     ''
 
+    ##
+    ## Extra custom steps
+    ##
     + extraBuildCommands;
 
   meta =