add possible linux kernel config path #561
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There are several paths to obtain current kernel config on Linux:
/proc/config.gz: available since Linux 2.6 and needsCONFIG_IKCONFIG_PROC=y;/boot/configand/boot/config-%s: available in most Debian-based distros, but NOT in Arch Linux or Gentoo.However, for those kernels where
CONFIG_IKCONFIG_PROCis not set, both of them are unavailable. According to proc(5), the kernel config can be found at/lib/modules/$(uname -r)/build/.config.This PR adds it to the search paths.
Q: Is there really any kernel that is compiled without
CONFIG_IKCONFIG_PROC?Yes. Xanmod is a popular kernel among users which does not have
CONFIG_IKCONFIGenabled.