Save sys-info to file instead of a text block

The main reason for this change is this file is typically used when making bug reports,
its best if users attach this file to reports directly.

release/scripts/modules/sys_info.py

@@ -21,7 +21,7 @@
 # classes for extracting info from blenders internal classes
 
 
-def write_sysinfo(op):
+def write_sysinfo(filepath):
     import sys
 
     import textwrap
@@ -30,14 +30,6 @@ def write_sysinfo(op):
     import bpy
     import bgl
 
-    output_filename = "system-info.txt"
-
-    output = bpy.data.texts.get(output_filename)
-    if output:
-        output.clear()
-    else:
-        output = bpy.data.texts.new(name=output_filename)
-
     # pretty repr
     def prepr(v):
         r = repr(v)
@@ -49,6 +41,8 @@ def write_sysinfo(op):
         return r
 
 
+    output = open(filepath, 'w', encoding="utf-8")
+
     header = "= Blender %s System Information =\n" % bpy.app.version_string
     lilies = "%s\n\n" % ((len(header) - 1) * "=")
     output.write(lilies[:-1])
@@ -204,6 +198,5 @@ def write_sysinfo(op):
         output.write(title("Cycles"))
         output.write(cycles.engine.system_info())
 
-    output.current_line_index = 0
+    output.close()
 
-    op.report({'INFO'}, "System information generated in 'system-info.txt'")