* cygheap.h (cygheap_pwdgrp): Remove constants NSS_FILES and NSS_DB.

	* cygheap.h (cygheap_pwdgrp): Remove constants NSS_FILES and NSS_DB.
	Use NSS_SRC_FILES and NSS_SRC_DB throughout instead.
	(cygheap_pwdgrp::nss_pwd_src): New inline method.
	(cygheap_pwdgrp::nss_grp_src): Ditto.
	* external.cc (cygwin_internal): Add CW_GETNSS_PWD_SRC and
	CW_GETNSS_GRP_SRC cases.
	* uinfo.cc: Use NSS_SRC_FILES and NSS_SRC_DB throughout.
	* include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
	* include/sys/cygwin.h (cygwin_getinfo_types): Add CW_GETNSS_PWD_SRC
	and CW_GETNSS_GRP_SRC.
	(NSS_SRC_FILES): Define.
	(NSS_SRC_DB): Define.