bustage fix, staging only - kernel version for linux is wrong

tools/release/configs/fx-moz19-staging-bootstrap.cfg

@@ -37,7 +37,7 @@ verifyDir       = /builds/verify
 tagDir          = /builds/tags
 configBumpDir   = /builds/config
 # Build platform, as specified by tinderbox
-linux_buildPlatform   = Linux_2.6.18-53.1.13.el5_Depend
+linux_buildPlatform   = Linux_2.6.18-8.el5_Depend
 macosx_buildPlatform  = Darwin_8.8.4_Depend
 win32_buildPlatform   = WINNT_5.2_Depend
 linux_l10n_buildPlatform   = Linux_2.6.18-53.1.13.el5_Depend