yacc: remove trailing end of line at end of file

There are still spurious spaces at the end of some lines.  But this is
addressed in the master branch, and I am reluctant to try to backport
this.

* data/yacc.c, data/glr.c, data/lalr1.cc, data/glr.cc: here.
* tests/calc.at (AT_CHECK_SPACES): New.
Use it.
Be sure not to introduce trailing empty lines in the *.y files.
* NEWS: Doc it.
* cfg.mk (syntax-check): Remove the exception.

tests/calc.at

@@ -386,11 +386,9 @@ AT_YYERROR_SEES_LOC_IF([
   fprintf (stderr, ": ");])
   fprintf (stderr, "%s\n", s);
 }])[
-
 ]AT_DEFINES_IF([],
 [AT_CALC_LEX
-AT_CALC_MAIN])[
-]])
+AT_CALC_MAIN])])
 
 AT_DEFINES_IF([AT_DATA_SOURCE([[calc-lex.c]AT_SKEL_CC_IF([[c]])],
 [[#include "calc.h]AT_SKEL_CC_IF([[h]])["
@@ -500,6 +498,20 @@ AT_CHECK([cat stderr], 0, [expout])
 ])
 
 
+# AT_CHECK_SPACES([FILE])
+# -----------------------
+# Make sure we did not introduce bad spaces.  Checked here because all
+# the skeletons are (or should be) exercized here.
+m4_define([AT_CHECK_SPACES],
+[# No initial empty lines.
+AT_CHECK([sed -ne '/./q;=;p;' $1])
+# No trailing spaces.
+# FIXME: For 2.7: AT_CHECK([sed -ne '/[ ]$/{=;p;}' $1])
+# No final empty lines.
+AT_CHECK([sed -ne '${/^$/{=;p;};}' $1])
+])
+
+
 # AT_CHECK_CALC([BISON-OPTIONS])
 # ------------------------------
 # Start a testing chunk which compiles `calc' grammar with
@@ -514,6 +526,8 @@ AT_BISON_OPTION_PUSHDEFS([$1])
 
 AT_DATA_CALC_Y([$1])
 AT_FULL_COMPILE([calc], AT_DEFINES_IF([[lex], [main]]))
+AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([cc], [c])])
+AT_DEFINES_IF([AT_CHECK_SPACES([calc.AT_SKEL_CC_IF([hh], [h])])])
 
 # Test the priorities.
 _AT_CHECK_CALC([$1],