no neet to check GF_LIB_PATH. GF will do it anyway

Setup.bat

@@ -27,21 +27,9 @@ REM Check command line options
 goto Loop
 :Continue
 
-REM Try to determine install location
-if "%dest%"=="" (
-  REM Separate paths with search path separator ; and pick first one
-  for %%p in ("%GF_LIB_PATH:;=";"%") do (
-    set dest=%%~p
-    goto BreakLibPath
-  )
-)
-:BreakLibPath
-
 if "%dest%"=="" (
   echo Unable to determine where to install the RGL. Please do one of the following:
   echo  - Pass the --dest=... flag to this script
-  echo  - Set the GF_LIB_PATH environment variable
-  REM echo  - Compile & install GF from the gf-core repository (must be in same directory as gf-rgl)
   exit /b
 )