[LyX/master] Amend 26fa3b3d, Cmake build: Move interpretation of configure.ac to own function

[Kornel Benko]

commit 690ad94f9edc3e41226e475080b9ec79a486c669
Author: Kornel Benko <kornel at lyx.org>
Date:   Mon Jul 13 10:17:54 2020 +0200

    Amend 26fa3b3d, Cmake build: Move interpretation of configure.ac to own function
    
    Use of posix packaging needs to be known prior to call to determineversionandbuildtype()
    (Spotted by Scott)
---
 CMakeLists.txt |   29 ++++++++++++++---------------
 1 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ccf7b3..b0f76d5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,8 +103,21 @@ include(LyXMacros)
 include(LyXDestinations)
 
 # Try to get some informations from configure.ac
-
 include(LyXPaths)
+
+# Value of USE_POSIX_PACKAGING is needed in determineversionandbuildtype()
+if(WIN32)
+	set(CMAKE_PREFIX_PATH Specify-path-to-Qt CACHE PATH "Used Qt version")
+	if(MSVC)
+		set(LYX_3RDPARTY_BUILD ON CACHE BOOL "Build 3rdparty libraries" FORCE)
+	endif()
+	set(USE_WINDOWS_PACKAGING ON)
+elseif(APPLE)
+	set(USE_MACOSX_PACKAGING ON)
+else()
+	set(USE_POSIX_PACKAGING ON)
+endif()
+
 determineversionandbuildtype("${TOP_SRC_DIR}/configure.ac" _package_list _version_list _envlist LYX_DATE LYX_BUILD_TYPE)
 list(GET _package_list 0 PACKAGE_BASE)
 list(GET _package_list 1 PACKAGE_VERSION)
@@ -356,20 +369,6 @@ else()
 	endif()
 endif()
 
-file(STRINGS "${TOP_SRC_DIR}/configure.ac" _config_lines)
-
-if(WIN32)
-	set(CMAKE_PREFIX_PATH Specify-path-to-Qt CACHE PATH "Used Qt version")
-	if(MSVC)
-		set(LYX_3RDPARTY_BUILD ON CACHE BOOL "Build 3rdparty libraries" FORCE)
-	endif()
-	set(USE_WINDOWS_PACKAGING ON)
-elseif(APPLE)
-	set(USE_MACOSX_PACKAGING ON)
-else()
-	set(USE_POSIX_PACKAGING ON)
-endif()
-
 if(LYX_3RDPARTY_BUILD)
   # LYX_3RDPARTY_BUILD is not cached anymore, but for compatibility reasons
   # this enables the build of all 3rd_party libs