fixed issues with build script

compile

@@ -1,5 +1,7 @@
 #!/bin/bash
 
+mkdir -p bin
+
 cd src
 
 echo -e "\e[1m\e[37mGenerating grammer2.5.inc\e[0m"
@@ -13,7 +15,7 @@ echo -e "\e[1m\e[37mAssembling App\e[0m"
 spasm grammer.z80 ../bin/grammer.8xk -I ../z80float/single
 
 # Check for an experimental package
-if [ ! -f "experimental/experimental.z80" ];then
+if [ ! -f "../bin/EXPRMNTL.8xv" ];then
   echo -e "\e[1m\e[37mAssembling Experimental Package\e[0m"
   spasm experimental/experimental.z80 ../bin/EXPRMNTL.8xv -I single
 fi