Used the BEE_FUNC_VSWPRINTF macro to determine if the target system supports the vswprintf function; specified AC_LANG_CPLUSPLUS so that AC_TRY_COMPILE/LINK would do compilation tests using CXX.
Used the BEE_FUNC_VSWPRINTF macro to determine if the target system supports the vswprintf function; specified AC_LANG_CPLUSPLUS so that AC_TRY_COMPILE/LINK would do compilation tests using CXX.

revl/libb