Adjust handling of package infos.

* add HAIKU_PACKAGING_ARCH, which is set to the target packaging 
  architecture
* introduce support for generic package infos, which are package infos
  that are the same for all architectures, except for the declaration
  of the package architecture itself
* move package info files underneath architecture-specific or generic
  folder

build/scripts/build_haiku_package

@@ -9,6 +9,8 @@ set -o errexit
 # tmpDir
 # compressionLevel
 # updateOnly
+# cc
+# packagingArch
 #
 # addattr
 # copyattr
@@ -113,6 +115,16 @@ echo "$packageName: mimeset'ing package contents ..."
 $mimeset --mimedb "$mimeDB" "$contentsDir"
 
 
+# create the package-info from a generic package-info if needed
+if [ $(basename $(dirname $packageInfoPath)) = 'generic' ]; then
+	echo "$packageName: Creating real package info from generic one ..."
+	genericPackageInfoPath=$packageInfoPath
+	packageInfoPath=$tmpDir/.PackageInfo
+	cat "$genericPackageInfoPath" \
+		| $cc -E -DHAIKU_PACKAGING_ARCH=$packagingArch - > "$packageInfoPath"
+fi
+
+
 # create the package
 if [ ! $updateOnly ]; then
 	echo "$packageName: Creating the package ..."