global: remove unnecessary horizontal tabs.

This change was made by applying emacs' untabify function to
nearly all files in Bison's repository.  Required tabs in make
files, ChangeLog, regexps, and test code were manually skipped.
Other notable exceptions and changes are listed below.
* bootstrap: Skip because we sync this with gnulib.
* data/m4sugar/foreach.m4
* data/m4sugar/m4sugar.m4: Skip because we sync these with
Autoconf.
* djgpp: Skip because I don't know how to test djgpp properly, and
this code appears to be unmaintained anyway.
* README-hacking (Hacking): Specify that tabs should be avoided
where not required.

doc/local.mk

@@ -15,9 +15,9 @@
 
 AM_MAKEINFOFLAGS = --no-split
 info_TEXINFOS = doc/bison.texinfo
-doc_bison_TEXINFOS =				\
-  $(CROSS_OPTIONS_TEXI)				\
-  doc/fdl.texi					\
+doc_bison_TEXINFOS =                            \
+  $(CROSS_OPTIONS_TEXI)                         \
+  doc/fdl.texi                                  \
   doc/gpl-3.0.texi
 
 CLEANFILES = doc/bison.fns
@@ -35,7 +35,7 @@ $(CROSS_OPTIONS_TEXI): doc/bison.help $(CROSS_OPTIONS_PL)
 # diff in the next run.  Note that $@ might not exist yet.
 	{ test ! -f $@ || cat $@; } >$@~
 	test ! -f $@.tmp || rm -f $@.tmp
-	src/bison$(EXEEXT) --help |					 \
+	src/bison$(EXEEXT) --help |                                      \
 	  perl $(CROSS_OPTIONS_PL) $(top_srcdir)/src/scan-gram.l >$@.tmp
 	diff -u $@~ $@.tmp || true
 	mv $@.tmp $@
@@ -101,14 +101,14 @@ remove_time_stamp = \
 # Depend on configure to get version number changes.
 $(top_srcdir)/doc/bison.1: doc/bison.help doc/bison.x $(top_srcdir)/configure
 	@echo "Updating man page $@"
-	$(HELP2MAN)					\
-	    --include=$(top_srcdir)/doc/bison.x		\
+	$(HELP2MAN)                                     \
+	    --include=$(top_srcdir)/doc/bison.x         \
 	    --output=$@.t src/bison$(EXEEXT)
-	if $(remove_time_stamp) $@ >$@a.t 2>/dev/null &&		 \
+	if $(remove_time_stamp) $@ >$@a.t 2>/dev/null &&                 \
 	   $(remove_time_stamp) $@.t | cmp $@a.t - >/dev/null 2>&1; then \
-	  touch $@;							 \
-	else								 \
-	  mv $@.t $@;							 \
+	  touch $@;                                                      \
+	else                                                             \
+	  mv $@.t $@;                                                    \
 	fi
 	rm -f $@*.t