[gimp] build/win: Fix string comparison in split-build for non-bash shells.

[Michael Henning <mhenning src gnome org>]

commit 09bec557d4ae19fa8924ebfebd2fb59f767444aa
Author: Michael Henning <drawoc darkrefraction com>
Date:   Mon Oct 28 19:33:26 2013 -0400

    build/win: Fix string comparison in split-build for non-bash shells.

 build/windows/jhbuild/split-build |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build/windows/jhbuild/split-build b/build/windows/jhbuild/split-build
index 2eee4af..a221d0f 100755
--- a/build/windows/jhbuild/split-build
+++ b/build/windows/jhbuild/split-build
@@ -1,7 +1,7 @@
 #!/bin/sh
 set -e
 
-if [ "x$BUILD_FLAVOUR" == "xdbg" ]; then
+if [ "x$BUILD_FLAVOUR" = "xdbg" ]; then
        EXT="-dbg"
 else
        EXT=""