build: avoid configure warning for Linux 4.15

Commit 4603d3e0f477dcb795a69196071cda66211819c0 and others
erroneously changed the acceptance range from >=4.15 to >=4.17.
Return to previous state.

diff --git a/configure.ac b/configure.ac
index 1645a1124d2216d256563b70d7d180146236f62f..2c31263974cc918c845942e777c4aaa8da816ed7 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -61,7 +61,7 @@ if test -n "$kbuilddir"; then
                        echo "WARNING: That kernel version is not officially supported yet. Continue at own luck.";
                elif test "$kmajor" -eq 5 -a "$kminor" -ge 0; then
                        :
-               elif test "$kmajor" -eq 4 -a "$kminor" -ge 18; then
+               elif test "$kmajor" -eq 4 -a "$kminor" -ge 15; then
                        :
                else
                        echo "WARNING: That kernel version is not officially supported.";