Add forward declarations to ForeignLib tests

cabal-testsuite/PackageTests/ForeignLibs/UseLib.c

 #include <stdio.h>
+#include <stdbool.h>
+
+/* Forward declarations */
+bool myForeignLibInit();
+void myForeignLibExit();
+void sayHi();
 
 int main()
 {

cabal-testsuite/PackageTests/ForeignLibs/csrc/MyForeignLibWrapper.c

 #include <stdlib.h>
+#include <stdbool.h>
 #include "HsFFI.h"
 
-HsBool myForeignLibInit(void){
+bool myForeignLibInit(void){
   int argc = 2;
   char *argv[] = { "+RTS", "-A32m", NULL };
   char **pargv = argv;
@@ -11,7 +12,7 @@ HsBool myForeignLibInit(void){
 
   // do any other initialization here and
   // return false if there was a problem
-  return HS_BOOL_TRUE;
+  return true;
 }
 
 void myForeignLibExit(void){

cabal-testsuite/PackageTests/ForeignLibs/my-foreign-lib.cabal

@@ -20,6 +20,7 @@ foreign-library myforeignlib
 
   other-modules:       MyForeignLib.Hello
                        MyForeignLib.SomeBindings
+                       MyForeignLib.AnotherVal
   build-depends:       base, my-foreign-lib
   hs-source-dirs:      src
   c-sources:           csrc/MyForeignLibWrapper.c
@@ -34,6 +35,7 @@ foreign-library versionedlib
 
   other-modules:       MyForeignLib.Hello
                        MyForeignLib.SomeBindings
+                       MyForeignLib.AnotherVal
   build-depends:       base, my-foreign-lib
   hs-source-dirs:      src
   c-sources:           csrc/MyForeignLibWrapper.c

cabal-testsuite/PackageTests/ForeignLibs/setup.test.hs

@@ -35,7 +35,8 @@ main = setupAndCabalTest . recordMode DoNotRecord $ do
 
         -- Link a C program against the library
         _ <- runProgramM gccProgram
-            [ "-o", "uselib"
+            [ "-std=c11", "-Wall"
+            , "-o", "uselib"
             , "UseLib.c"
             , "-l", "myforeignlib"
             , "-L", flibdir installDirs ]