sysutils/consolekit: prevent from using linux/input.h if present

OK for this?

Index: Makefile
===================================================================
RCS file: /cvs/ports/sysutils/consolekit/Makefile,v
diff -u -p -r1.104 Makefile
--- Makefile 17 Sep 2023 09:38:05 -0000 1.104
+++ Makefile 1 Nov 2023 18:58:06 -0000
@@ -4,7 +4,7 @@ GH_TAGNAME= 1.2.6
GH_ACCOUNT= ConsoleKit2
GH_PROJECT= ConsoleKit2
PKGNAME= ${DISTNAME:L}
-REVISION= 2
+REVISION= 3

CATEGORIES= sysutils

@@ -34,6 +34,8 @@ CONFIGURE_STYLE= autoreconf
CONFIGURE_ARGS= --disable-pam-module \
--disable-libudev \
--with-pam-module-dir=${LOCALBASE}/lib/security \
+
+CONFIGURE_ENV += ac_cv_header_linux_input_h=no

# needed for 'make check'
CONFIGURE_ARGS += --enable-docbook-docs