Include foreign libs in allBuildInfo (fixes #4763)

(cherry picked from commit a641d1c)

Author: snoyberg

Cabal/Distribution/Types/PackageDescription.hs

@@ -314,6 +314,9 @@ allBuildInfo :: PackageDescription -> [BuildInfo]
 allBuildInfo pkg_descr = [ bi | lib <- allLibraries pkg_descr
                               , let bi = libBuildInfo lib
                               , buildable bi ]
+                      ++ [ bi | flib <- foreignLibs pkg_descr
+                              , let bi = foreignLibBuildInfo flib
+                              , buildable bi ]
                       ++ [ bi | exe <- executables pkg_descr
                               , let bi = buildInfo exe
                               , buildable bi ]

Cabal/changelog

@@ -7,6 +7,7 @@
 	* Added a new 'cabal check' warning about unused, undeclared or
 	non-Unicode flags.  Also, it warns about leading dash, which is
 	unusable but accepted if it's unused in conditionals. (#4687)
+	* Modify `allBuildInfo` to include foreign library info (#4763).
 	* Documentation fixes.
 
 2.0.0.2 Mikhail Glushenkov <[email protected]> July 2017