Set up blank top_srcdir if building in source directory.

This means short, relative names are used for C source files when
compiling in the source directory.

* Makefile (CFLAGS): Exclude -iquote $(top_srcdir) arguments
if top_srcdir is blank. Remove slash after $(top_srcdir),
since the variable includes it now, if its value is not blank.
(SRCS, ABBREV, opt/%-win.o, lex.yy.c, y.tab.c, install): Remove slash
after $(top_srcdir).
(dbg/%.o, opt/%.o): Only include rules for depending
on $(top_srcdir)%.c prerequisite if top_srcdir is not blank.
In the blank case, the rules are redundant.

* configure: if configuring in the root of the source tree,
establish top_srcdir as blank, otherwise establish is as
an absolute path with a trailing slash.

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