makekernel: Add big fallback to old toolchains
makekernel: Add big fallback to old toolchains

* Fix building under KitKat/LolliPop tree
* Also add details about auto-select toolchain

Change-Id: I11e381a904457a4000171d4a589bacad3a04eed6
Signed-off-by: Caio Oliveira <4db4e54f91055ffa8197b8408ec5b5470f9993b8@gmail.com>
Signed-off-by: Adrian DC <01fb3892f39957945220431e7409156544d2f041@gmail.com>

AdrianDC/android_development_shell_tools,AdrianDC/android_development_shell_tools