Add'l CI/git script tweaks, fixes

buildroot/bin/use_example_configs

 cd Marlin
 
 $TOOL "$EXAMPLES/$RDIR/Configuration.h"     >/dev/null 2>&1 && mv wgot Configuration.h
-$TOOL "$EXAMPLES/$RDIR/Configuration_adv.h" >/dev/null 2>&1 && mv wgot Configuration.h
-$TOOL "$EXAMPLES/$RDIR/_Bootscreen.h"       >/dev/null 2>&1 && mv wgot Configuration.h
-$TOOL "$EXAMPLES/$RDIR/_Statusscreen.h"     >/dev/null 2>&1 && mv wgot Configuration.h
+$TOOL "$EXAMPLES/$RDIR/Configuration_adv.h" >/dev/null 2>&1 && mv wgot Configuration_adv.h
+$TOOL "$EXAMPLES/$RDIR/_Bootscreen.h"       >/dev/null 2>&1 && mv wgot _Bootscreen.h
+$TOOL "$EXAMPLES/$RDIR/_Statusscreen.h"     >/dev/null 2>&1 && mv wgot _Statusscreen.h
 
 rm -f wgot
 cd - >/dev/null

buildroot/share/fonts/uxggenpages.sh

 }
 EOF
 
-which awk  >/dev/null && AWK=awk
-which gawk >/dev/null && AWK=gawk
+AWK=$(which gawk || which awk)
 
 grep -Hrn _UxGT . | grep '"' \
   | sed 's/_UxGT("/\n&/g;s/[^\n]*\n_UxGT("\([^"]*\)[^\n]*/\1 /g;s/.$//' \

buildroot/share/git/ghtp

     ;;
 esac
 
-which awk  >/dev/null && AWK=awk
-which gawk >/dev/null && AWK=gawk
+AWK=$(which gawk || which awk)
 
 REMOTES=$(git remote -v | egrep "\t$MATCH" | "$AWK" '{print $1 " " $2}' | sort -u | sed  "s/$FORMULA/")
 

buildroot/share/git/mfclean

 # Great way to clean up your branches after messing around a lot
 #
 
-which awk  >/dev/null && AWK=awk
-which gawk >/dev/null && AWK=gawk
+AWK=$(which gawk || which awk)
 
 KEEP="RC|RCBugFix|dev|master|bugfix-1|bugfix-2"