asterisk:
 * revise LOW_MEMORY option - select it in asterisk' menuselect instead of overriding CFLAGS all over makefiles. This way the corresponding #define gets written to asterisk/buildopts.h (#included from asterisk/autoconfig.h, #included from asterisk.h) => no need to set it manually, all 3rd-party modules #include asterisk.h
 * refs #706


git-svn-id: file:///var/svn/freetz/trunk@10728 149334a1-2f27-0410-a3b9-fc62619ac1e6