[LyX/2.3.x] Care for Qt library source directory rename for 5.12.x

[Stephan Witt]

commit d75fdd6e4711f3c6c5d80cd80171e4ced41ca294
Author: Stephan Witt <switt at lyx.org>
Date:   Thu Feb 6 22:16:13 2020 +0100

    Care for Qt library source directory rename for 5.12.x
    
    (cherry picked from commit a3e14fe6cdad91fc3b9dfd77319a92e8d994de06)
---
 development/LyX-Mac-binary-release.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/development/LyX-Mac-binary-release.sh b/development/LyX-Mac-binary-release.sh
index e29a575..5ea5d7d 100644
--- a/development/LyX-Mac-binary-release.sh
+++ b/development/LyX-Mac-binary-release.sh
@@ -9,7 +9,7 @@
 
 QtAPI=${QtAPI:-"-cocoa"}
 QtVersion=${QtVersion:-"4.6.3"}
-QtSourceVersion="qt-everywhere-opensource-src-${QtVersion}"
+QtSourceVersion=${QtSourceVersion:-"qt-everywhere-opensource-src-${QtVersion}"}
 QtBuildSubDir="qt-${QtVersion}-build${QtAPI}"
 QtConfigureOptions=${QtConfigureOptions:-"-release"}