Merge remote-tracking branch 'origin/maint'

* origin/maint:
  parser: accept #line NUM
  m4: use a safer pattern to enable/disable output
  tests: beware of gnulib's need for config.h
  gnulib: update
  yacc.c, glr.c: check and fix the display of locations
  formatting changes
  glr.c: remove stray macro

Conflicts:
	data/c.m4
	data/glr.cc
	data/lalr1.cc
	data/lalr1.java
	data/location.cc
	data/stack.hh
	data/yacc.c
	src/scan-gram.l

lib/.gitignore

@@ -273,3 +273,9 @@
 /xstrndup.h
 /binary-io.c
 /xsize.c
+/bitrotate.c
+/math.c
+/sig-handler.c
+/stdio.c
+/unistd.c
+/wctype-h.c