[LyX/master] Cmake build: Use only real absolute path to the cmake sources.

[Kornel Benko]

commit 5bc44b2cf290e2c3907851f57e2faff3d319fe67
Author: Kornel Benko <kor...@lyx.org>
Date:   Fri Dec 11 23:23:46 2015 +0100

    Cmake build: Use only real absolute path to the cmake sources.
    
    This change resolves symlinks, so that lyx called from the buil-dir
    always finds 'his' system dir.

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f1c86a..a5b8513 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,8 +10,9 @@ set(LYX_PROJECT LyX)
 
 enable_testing()
 
-get_filename_component(lyx_dir_readme ${CMAKE_SOURCE_DIR}/README ABSOLUTE)
+get_filename_component(lyx_dir_readme ${CMAKE_SOURCE_DIR}/README REALPATH) # 
Resolve symlinks
 get_filename_component(TOP_SRC_DIR ${lyx_dir_readme} PATH)
+message(STATUS "TOP_SRC_DIR = ${TOP_SRC_DIR}")
 
 set(LYX_CMAKE_DIR "development/cmake")
 set(TOP_CMAKE_PATH "${TOP_SRC_DIR}/${LYX_CMAKE_DIR}")