CMake: Add lirc library and header detection if pkg-config file does not exist.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 0dc685b82e)

ConfigureChecks.cmake

@@ -56,6 +56,18 @@ endif( WITH_LAME )
 
 if( BUILD_LIRC_PLUGIN )
   pkg_search_module( LIRC lirc )
+
+  if( NOT LIRC_FOUND )
+    check_library_exists( lirc_client lirc_init "" HAVE_LIRC )
+    if( HAVE_LIRC )
+      check_include_file( lirc/lirc_client.h HAVE_LIRC_CLIENT_H )
+      if( HAVE_LIRC_CLIENT_H )
+        set( LIRC_FOUND 1 )
+        set( LIRC_LIBRARIES "lirc_client" )
+      endif()
+    endif()
+  endif( NOT LIRC_FOUND )
+
   if( NOT LIRC_FOUND )
     tde_message_fatal( "lirc support is requested, but was not found on your system" )
   endif( NOT LIRC_FOUND )