respect cmake -DCPPAN_BUILD=OFF

Author: zdenop

CMakeLists.txt

@@ -101,6 +101,7 @@ endif()
 ###############################################################################
 
 if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.cppan)
+if(NOT EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/.cppan OR NOT CPPAN_BUILD)
     if (NOT Leptonica_DIR AND NOT MSVC)
         find_package(PkgConfig REQUIRED)
         pkg_check_modules(Leptonica REQUIRED lept>=${MINIMUM_LEPTONICA_VERSION})