Fix _BOOST_FIND_COMPILER_TAG.
Fix _BOOST_FIND_COMPILER_TAG.

	* build-aux/boost.m4 (_BOOST_FIND_COMPILER_TAG): Every modification
	to a cached variable must be done with AC_CACHE_CHECK.

aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport,aldebaran/libport