meson: move keyutils dependency check

Since there is not minimum version specified, and it's a test-only
dependency, it's fair to depend on a version that ships with a .pc I
suppose.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200828110734.1638685-8-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

configure

@@ -6312,28 +6312,6 @@ but not implemented on your system"
     fi
 fi
 
-##########################################
-# check for usable keyutils.h
-
-if test "$linux" = "yes" ; then
-
-    have_keyutils=no
-    cat > $TMPC << EOF
-#include <errno.h>
-#include <asm/unistd.h>
-#include <unistd.h>
-#include <sys/types.h>
-#include <keyutils.h>
-int main(void) {
-    return request_key("user", NULL, NULL, 0);
-}
-EOF
-    if compile_prog "" "-lkeyutils"; then
-        have_keyutils=yes
-    fi
-fi
-
-
 ##########################################
 # End of CC checks
 # After here, no more $cc or $ld runs
@@ -7522,9 +7500,6 @@ fi
 
 if test "$secret_keyring" = "yes" ; then
   echo "CONFIG_SECRET_KEYRING=y" >> $config_host_mak
-  if test "$have_keyutils" = "yes" ; then
-    echo "CONFIG_KEYUTILS=y" >> $config_host_mak
-  fi
 fi
 
 if test "$tcg_interpreter" = "yes"; then