configure: Disable i686 for i586 and lower CPUs

diff --git a/configure b/configure
index 6e210bb..a7b3c55 100755 (executable)
--- a/configure
+++ b/configure
@@ -3296,6 +3296,7 @@ elif enabled x86; then
     case $cpu in
         i[345]86|pentium)
             cpuflags="-march=$cpu"
+            disable i686
             disable mmx
         ;;
         # targets that do NOT support nopl and conditional mov (cmov)