Register .set_acl unconditionally to fix POSIX ACL writes over NFS

Scoutfs has supported posix ACLs through the xattr handler table,
which allowed NFS to fetch them through this sideband, which worked
for older kernels.

With recent changes we've pulled in .get_acl because the mainline
kernel is changing how ACL ops are called. But we still left .set_acl
unreachable. This meant that on el9.7 nfs clients could now reach
.get_acl, but still not set them.

With this change, we're finally exposing .set_acl consistently
across all el releases and allowing nfs clients to both get and set
posix ACLs.

Signed-off-by: Auke Kok <auke.kok@versity.com>

kmod/src/Makefile.kernelcompat

@@ -479,6 +479,16 @@ ifneq (,$(shell grep '^unsigned int stack_trace_save' include/linux/stacktrace.h
 ccflags-y += -DKC_STACK_TRACE_SAVE
 endif
 
+#
+# v3.14-rc1-7-g4e34e719e457
+#
+# .set_acl callback added to struct inode_operations.  Most kernels
+# we target have it, but el7 (3.10 base) does not, so detect.
+#
+ifneq (,$(shell grep 'int ..set_acl..struct' include/linux/fs.h))
+ccflags-y += -DKC_HAS_SET_ACL
+endif
+
 #
 # v6.1-rc1-2-g138060ba92b3
 #