[gimp] devel-docs: document new debugging option --enable-win32-debug-console.

[Jehan <jehanp src gnome org>]

commit 96dc7da000d7796403ddc05350743cf0e153c066
Author: Jehan <jehan girinstud io>
Date:   Mon Aug 20 17:28:11 2018 +0200

    devel-docs: document new debugging option --enable-win32-debug-console.

 devel-docs/debugging-tips.txt | 9 +++++++++
 1 file changed, 9 insertions(+)
---
diff --git a/devel-docs/debugging-tips.txt b/devel-docs/debugging-tips.txt
index aba0ae66cc..a6a589638c 100644
--- a/devel-docs/debugging-tips.txt
+++ b/devel-docs/debugging-tips.txt
@@ -85,6 +85,15 @@ Make X calls synchronous so that your crashes happen immediately with:
 
 You can also break on `gdk_x_error()`.
 
+## Debugging on Windows ##
+
+Even when run from a `cmd`, the standard and error outputs are not
+displayed in the terminal. For this reason, unstable builds (i.e. with
+odd minor version) pop up a debug console at start.
+
+If you are building stable versions of GIMP for debugging and want this
+debug console as well, configure with `--enable-win32-debug-console`.
+
 ## Debugging icons ##
 
 See file `devel-docs/icons.txt` to learn more about our icons, and in