Configtool: use platform.startswith() everywhere.

Using this instead of a direct comparison may make the code more
future proof, because exact versions (e.g. "win32" vs. "win64")
are ignored, then.

configtool/boardpanel.py

@@ -157,7 +157,7 @@ class BoardPanel(wx.Panel):
     if not self.confirmLoseChanges("load a new board configuration"):
       return
 
-    if platform == "darwin":
+    if platform.startswith("darwin"):
       # Mac OS X appears to be a bit limited on wildcards.
       wildcard = "Board configuration (board.*.h)|*.h"
     else:

configtool/build.py

@@ -256,7 +256,7 @@ class Build(wx.Dialog):
     # Windows. Without this it always drops this error message:
     #   collect2.exe: error: ld returned 5 exit status 255
     # Just enabling verbose messages allows ld.exe to complete without failure.
-    if platform == "win32":
+    if platform.startswith("win"):
       cmdpath += " -Wl,-V"
 
     ofiles = ["\"" + join(self.root, "build", f) + "\""

configtool/data.py

@@ -24,7 +24,7 @@ BSIZE = (100, 60)
 BSIZESMALL = (90, 30)
 
 
-if platform == "win32":
+if platform.startswith("win"):
   offsetTcLabel = 4
   offsetChLabel = 4
 else:

configtool/printerpanel.py

@@ -140,7 +140,7 @@ class PrinterPanel(wx.Panel):
     if not self.confirmLoseChanges("load a new printer configuration"):
       return
 
-    if platform == "darwin":
+    if platform.startswith("darwin"):
       # Mac OS X appears to be a bit limited on wildcards.
       wildcard = "Printer configuration (printer.*.h)|*.h"
     else: