Use terminfo to highlight warnings and errors in blue and red

This replaces the hardwired ANSI escape codes that were accidentally included
in a previous patch.

This adds a dependency on terminfo, but this should be unproblematic, since
haskeline already depends on the same underlying C library.

The color highlighting is omitted on Windows.

1 files changed, 1 insertions, 1 deletions

diff --git a/gf.cabal b/gf.cabal
index c60989d2f..ce1c24f0a 100644
--- a/gf.cabal
+++ b/gf.cabal
@@ -289,7 +289,7 @@ Library
   if os(windows)
     build-depends: Win32
   else
-    build-depends: unix
+    build-depends: unix, terminfo>=0.4
 
 
 Executable gf