libgo: don't include <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.

Fixes https://gcc.gnu.org/PR106266

Change-Id: I394ac26344369a9713c541a6468cefa31f60a79e
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/417294
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
diff --git a/libgo/sysinfo.c b/libgo/sysinfo.c
index a4259c0..fc02109 100644
--- a/libgo/sysinfo.c
+++ b/libgo/sysinfo.c
@@ -158,9 +158,6 @@
 #if defined(HAVE_LINUX_ETHER_H)
 #include <linux/ether.h>
 #endif
-#if defined(HAVE_LINUX_FS_H)
-#include <linux/fs.h>
-#endif
 #if defined(HAVE_LINUX_REBOOT_H)
 #include <linux/reboot.h>
 #endif