[LyX/master] Cmake build: Only use the new lyxconvert on MAC

[Kornel Benko]

commit 76614624003c53977efa3b02861c69745c78c6ec
Author: Kornel Benko <kor...@lyx.org>
Date:   Tue Oct 3 22:12:23 2017 +0200

    Cmake build: Only use the new lyxconvert on MAC
---
 src/CMakeLists.txt |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index dc21812..39c751f 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -17,7 +17,9 @@ add_subdirectory(insets)
 add_subdirectory(mathed)
 add_subdirectory(support)
 add_subdirectory(tex2lyx)
-add_subdirectory(convert)
+if (APPLE)
+  add_subdirectory(convert)
+endif()
 if (UNIX)
        add_subdirectory(client)
 endif()