lsp_mg_read: remove dead code, return nil on empty read

Fix parameter 1 for select in poll()

_CRT_SECURE_NO_WARNINGS should not generate a warning if already defined

	modified:   mongoose.c

Environment variable required for PHP cgi

In few windows machines, the environment variables "ProgramFiles" is required to successfully execute PHP code especially socket functions.

Fixed crash and description for digest authentication

fixed/extended global_auth_file description.

when having connections with and without auth would cause double free and then crash