Makefile.am (sources): Add bitset.cc

Makefile.am (sources): Add bitset.cc

	* src/Makefile.am (sources): Add bitset.cc
	* src/Makefile.in: Regenrate.

	* include/bits/std_bitset.h (_GLIBCPP_BITSET_BITS_PER_WORD): New
	macro. Replace __BITS_PER_WORDS throughout.
	(__BITS_PER_WORDS): Remove.
	(bitset<>::_M_do_find_first, bitset<>::_M_do_find_next): Move
	definitions to src/bitset.cc.

	* src/bitset.cc (bitset<>::_M_do_find_first,
	bitset<>::_M_do_find_next):  Define here.
	(_Bit_count<>::_S_bit_count, _Find_one<>::_S_first_one): Define
	here. Explicitly instantiate definitions.

From-SVN: r37837