cache kernelVersion(), make isAtLeastKernelVersion() cheaper

not perfect due to this being in a header file, so multiple copies
potentially exist, but it's really simple, and works nearly as well.

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Id90c6933d57bc12f4dd640c8918fd0885c7474cf
2 files changed
tree: e6e7845a4a4a5035049aa1ce2db67b8c5ae9181c
  1. staticlibs/