windows bat files don't have getting/generating builtins.txt features so ported them from linux shell

Author: Makopo

pre_win.sh

@@ -0,0 +1,10 @@
+# run this on mingw before running creator_win*.sh
+
+curl -O https://raw.githubusercontent.com/Sei-Lisa/kwdb/master/outputs/builtins.txt
+
+echo "#ifdef _MSC_VER" > builtins_txt.cc
+echo "#pragma execution_character_set(\"utf-8\")" >> builtins_txt.cc
+echo "#endif" >> builtins_txt.cc
+echo "const char *builtins_txt[] = {" >> builtins_txt.cc
+sed -e '/^\/\//d; s/"/\\\"/g; s/^/"/; s/$/",/' builtins.txt >> builtins_txt.cc || { rm -f builtins_txt.cc ; false ; }
+echo "(char*)0 };" >> builtins_txt.cc