After commits 21095fab6 and acce58834, 'make dist-create-release' fails.
1. kconf_id.c is gone but it is still listed in EXTRA_DIST.
2. Only the files not listed in xxx_SOURCES need to be placed in
EXTRA_LIST. confdata.c, expr.c and others were previously not compiled
separately, they were #include'd from parser.y. Now they are listed in
xxx_SOURCES and should be removed from EXTRA_DIST. Note that menu.c is
still #include'd through parser.y, so it is kept.
3. parser.tab.c and lexer.lex.c should not be included in the
distribution tarball; they were previously omitted by virtue of not
being listed in xxx_SOURCES directly. Without it, `make distcheck`
fails.
Signed-off-by: Alexey Neyman <aneyman@lynx.com>