Remove deprecated egrep calls

setup/build_linux

@@ -35,9 +35,9 @@ fi
 function ask() {
   while :; do
     read -p "$1 [Y/N] " -r answer
-    if echo "$answer" | egrep -iq '^(y|yes|sure)$'; then
+    if echo "$answer" | grep -Eiq '^(y|yes|sure)$'; then
       return 0
-    elif echo "$answer" | egrep -iq '^(n|no|nope)$'; then
+    elif echo "$answer" | grep -Eiq '^(n|no|nope)$'; then
       return 1
     fi
   done
@@ -67,7 +67,7 @@ function fix_kit_permissions() {
 function load_settings() {
   dos2unix "$ROOT_DIR/scripts/wk/cfg/main.py"
   while read line; do
-    if echo "$line" | egrep -q "^\w+='"; then
+    if echo "$line" | grep -Eq "^\w+='"; then
       line="$(echo "$line" | sed -r 's/[\r\n]+//')"
       eval "$line"
     fi