Adjust to changed HaikuPorts repository layout

The package kit actually requires the files "repo", "repo.info",
"repo.sha256" to be located under the repository base URL, so the
approach to name the repository file "repo-<hash>" doesn't work.
Now there's a directory "<hash>" which contains the files.

This commit moves the computation of the hash and downloading the
repository file from the build_haiku_image script to the jam build
system. The repo.info is also downloaded and a repository config file
is generated.

build/scripts/build_haiku_image

@@ -8,6 +8,7 @@ set -o errexit
 # addBuildCompatibilityLibDir
 # systemPackages, commonPackages - lists of the hpkg packages copied/updated
 #   (in "system" and "common" respectively)
+# repositories - all repository files
 # downloadDir
 # The following are only for image types:
 # installDir
@@ -306,21 +307,8 @@ done
 if [ -n "$resolvePackageDependencies" ]; then
 	echo "Resolving package dependencies ..."
 
-	repoFiles=
-	for repository in $repositories; do
-		eval 'repositoryPackageList=$repositoryPackageList_'$repository
-		eval 'repositoryUrl=$repositoryUrl_'$repository
-		packageListHash=`sha256sum $repositoryPackageList \
-			| sed -r 's,([^[:space:]]*).*,\1,'`
-		repoFileName=repo-$packageListHash
-		repoFileUrl="$repositoryUrl/repos/$repoFileName"
-		repoFilePath="$downloadDir/$repoFileName"
-		downloadFile $repoFileUrl $repoFilePath
-		repoFiles="$repoFiles $repoFilePath"
-	done
-
 	# additional packages for system
-	packageUrls=`$getPackageDependencies $repoFiles -- $systemPackages`
+	packageUrls=`$getPackageDependencies $repositories -- $systemPackages`
 	for packageUrl in $packageUrls; do
 		packageFileName=`basename $packageUrl`
 		packageFilePath="$downloadDir/$packageFileName"
@@ -330,7 +318,7 @@ if [ -n "$resolvePackageDependencies" ]; then
 	done
 
 	# additional packages for common
-	packageUrls=`$getPackageDependencies $repoFiles -- $systemPackages \
+	packageUrls=`$getPackageDependencies $repositories -- $systemPackages \
 		$commonPackages`
 	for packageUrl in $packageUrls; do
 		packageFileName=`basename $packageUrl`