Bumped geek-sources-3.15-r1 to 3.15.1

Works fine with use[symlink], but fails with use[fedora] with the following error message:
drivers/pci/pci-sysfs.c:655:2: error: implicit declaration of function ‘secure_modules’ [-Werror=implicit-function-declaration]

I was unable to test with use[suse] due to network problems.

Sorry about the Manifest thing, I made sure to commit it this time.