AURORA: Use FilePath::isPOSIXAbsolute() in indexArchive()

This should fix #421.

src/aurora/resman.cpp

@@ -273,7 +273,7 @@ ResourceManager::KnownArchive *ResourceManager::findArchive(const Common::UStrin
 }
 
 ResourceManager::KnownArchive *ResourceManager::findArchive(Common::UString file, KnownArchives &archives) {
-	file = (Common::FilePath::isAbsolute(file) ? "" : "/") + file;
+	file = (Common::FilePath::isPOSIXAbsolute(file) ? "" : "/") + file;
 	file = Common::FilePath::normalize(file, false).toLower();
 
 	for (KnownArchives::iterator a = archives.begin(); a != archives.end(); ++a) {

src/aurora/resman.h

@@ -117,7 +117,9 @@ class ResourceManager : public Common::Singleton<ResourceManager> {
 
 	/** Add all the resources of an archive to the resource manager.
 	 *
-	 *  @param file The name of the archive file to index.
+	 *  @param file The name of the archive file to index. If the name starts with a "/",
+	 *              the file path must be in the root of the game data directory. Otherwise,
+	 *              subfolders are considered as well.
 	 *  @param priority The priority these files have over others of the same name
 	 *                  and type. Higher number = higher priority. 0 means blacklisted.
 	 *  @param changeID If given, record the collective changes done here.
@@ -127,7 +129,9 @@ class ResourceManager : public Common::Singleton<ResourceManager> {
 
 	/** Add all the resources of an archive to the resource manager.
 	 *
-	 *  @param file The name of the archive file to index.
+	 *  @param file The name of the archive file to index. If the name starts with a "/",
+	 *              the file path must be in the root of the game data directory. Otherwise,
+	 *              subfolders are considered as well.
 	 *  @param priority The priority these files have over others of the same name
 	 *                  and type. Higher number = higher priority. 0 means blacklisted.
 	 *  @param password Use this password to decrypt the archive file, if necessary.