Fix bad command in kernel version check

Author: asheimo

.gitignore

@@ -4,6 +4,7 @@ output_*/
 .DS_store
 config.log
 sandbox/
+.vs/
 
 meson-cross.mingw.txt
 /.vs/slnx.sqlite

.vs/ffmpeg-windows-build-helpers/v16/.suo

@@ -161,7 +161,7 @@ check_missing_packages () {
       exit 1
     fi
     export MINIMUM_KERNEL_VERSION = "4.19.128"
-    if uname -a | awk -F'[ ]' '{ print $3 }' | awk -F- '{ print $1 }' != $MINIMUM_KERNEL_VERSION then
+    if uname -a | awk -F'[ ]' '{ print $3 }' | awk -F- '{ print $1 }' != $MINIMUM_KERNEL_VERSION ; then
       echo "windows WSL detected: kernel not at minumum version required $MINIMUM_KERNEL_VERSION 
       please update via windows update then try again"        
       exit 1