Evaluate 'script' in the global scope

Scripts sourced via 'script' should evaluate in the global
scope to make it easy to set and reference global variables.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

src/helper/startup.tcl

@@ -53,9 +53,9 @@ proc find {filename} {
 add_usage_text find "<file>"
 add_help_text find "print full path to file according to OpenOCD search rules"
 
-# Run script
+# Find and run a script
 proc script {filename} {
-	source [find $filename]
+	uplevel #0 source [find $filename]
 }
 add_help_text script "filename of OpenOCD script (tcl) to run"
 add_usage_text script "<file>"