Renamed oserrcheck to __mappederrno. Added an additional function named

__directerrno and moved both to errno.s. Changed several sources to use these
functions. Needs testing.
                         


git-svn-id: svn://svn.cc65.org/cc65/trunk@4718 b7a2c559-68d2-44c3-8de9-860c34a00d81

libsrc/common/Makefile

@@ -146,7 +146,6 @@ S_OBJS = 	_cwd.o                  \
 		mkdir.o		        \
 		modfree.o               \
 		modload.o               \
-                oserrcheck.o            \
 		printf.o      	        \
 		putchar.o	        \
 		putenv.o	        \