[glibmm] clang-format: Disable SortIncludes.

[Murray Cumming <murrayc src gnome org>]

commit 4f9304b2a6e0ff786706a8e19025c10e3ef093de
Author: Murray Cumming <murrayc murrayc com>
Date:   Fri Feb 26 13:12:25 2016 +0100

    clang-format: Disable SortIncludes.
    
    Because this can break builds.

 .clang-format |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/.clang-format b/.clang-format
index 8d3b34c..c96d821 100644
--- a/.clang-format
+++ b/.clang-format
@@ -9,4 +9,5 @@ ColumnLimit: 100
 ConstructorInitializerAllOnOneLineOrOnePerLine: true
 ConstructorInitializerIndentWidth: 0
 IndentCaseLabels: false
+SortIncludes: false