* spawn.cc (find_exec): Accept a PATH-like string in place of an environment

variable.
* dlfcn.cc (get_full_path_of_dll): Search /usr/bin (for windows compatibility)
and /usr/lib (for UNIX compatibility) when looking for shared libraries.
* environ.cc (conv_envvars): Put back LD_LIBRARY_PATH since it is used by
get_full_path_of_dll().
* errno.cc (errmap): Map MOD_NOT_FOUND to ENOENT.
* cygmagic: Remove debugging cruft.

winsup/cygwin/errno.cc

@@ -86,6 +86,7 @@ static NO_COPY struct
   X (LOCK_VIOLATION,		EACCES),
   X (MAX_THRDS_REACHED,		EAGAIN),
   X (META_EXPANSION_TOO_LONG,	EINVAL),
+  X (MOD_NOT_FOUND,		ENOENT),
   X (MORE_DATA,			EAGAIN),
   X (NEGATIVE_SEEK,		EINVAL),
   X (NETNAME_DELETED,		ENOSHARE),