This libgo patch stops including <linux/fs.h> when building
gen-sysinfo.go.  Removing this doesn't change anything at least with
glibc 2.33.  The include was added in https://go.dev/cl/6100049 but
it's not clear why.  This should fix GCC PR 106266.  Bootstrapped and
ran Go testsuite on x86_64-pc-linux-gnu.  Committed to mainline.

Ian