Bug#674231: archivemount: Add 7zip support

[Reco]

archive_read_open_fd was also using for reading and saving archives.
Original patch did not address these, this one does.

Reco

--- archivemount-0.8.7.orig/archivemount.c
+++ archivemount-0.8.7/archivemount.c
@@ -450,7 +450,7 @@ build_tree( const char *mtpt )
            return archive_errno( archive );
        }
    }
-   if( archive_read_open_fd( archive, archiveFd, 10240 ) != ARCHIVE_OK ) {
+   if( archive_read_open_filename( archive, archiveFile, 10240) != ARCHIVE_OK ) {
        fprintf( stderr, "%s\n", archive_error_string( archive ) );
        return archive_errno( archive );
    }
@@ -909,7 +909,7 @@ save( const char *archiveFile )
        log( "%s", archive_error_string( oldarc ) );
        return archive_errno( oldarc );
    }
-   if( archive_read_open_fd( oldarc, archiveFd, 10240 ) != ARCHIVE_OK ) {
+   if( archive_read_open_filename( oldarc, archiveFile, 10240 ) != ARCHIVE_OK ) {
        log( "%s", archive_error_string( oldarc ) );
        return archive_errno( oldarc );
    }
@@ -1311,7 +1311,7 @@ _ar_read( const char *path, char *buf, s
                return -EIO;
            }
        }
-       archive_ret = archive_read_open_fd( archive, archiveFd, 10240 );
+       archive_ret = archive_read_open_filename( archive, archiveFile, 10240);
        if( archive_ret != ARCHIVE_OK ) {
            log( "archive_read_open_fd(): %s (%d)\n",
                archive_error_string( archive ), archive_ret );