Add `forkProcessWithUnmask` function

This seemed to be an obvious addition while working on #8433.

Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/unix.cabal b/unix.cabal
index 2f729ba..3ad3c98 100644
--- a/unix.cabal
+++ b/unix.cabal
@@ -54,6 +54,7 @@ library
         InterruptibleFFI
         NoMonomorphismRestriction
         OverloadedStrings
+        RankNTypes
 
     if impl(ghc)
         other-extensions: