Documentation: Remove unused a2x check

a2x is never used although its presence is checked mandatorily.
Let's remove this superfluous check and the unused entry.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Dmitry Safonov <0x7f454c46@gmail.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>

Documentation/Makefile

@@ -3,7 +3,6 @@ include $(__nmk_dir)include.mk
 include $(__nmk_dir)macro.mk
 
 ASCIIDOC	:= asciidoc
-A2X		:= a2x
 XMLTO		:= xmlto
 
 FOOTER		:= footer.txt
@@ -29,7 +28,7 @@ pdf: $(PDFS)
 .PHONY: all ps pdf check
 
 check:
-	$(Q) for B in $(ASCIIDOC) $(A2X) $(XMLTO); do	\
+	$(Q) for B in $(ASCIIDOC) $(XMLTO); do	\
 		$$B --version > /dev/null || exit 1;	\
 	done
 

scripts/nmk/Documentation/Makefile

 ASCIIDOC	:= asciidoc
-A2X		:= a2x
 XMLTO		:= xmlto
 PS2PDF		:= ps2pdf
 
@@ -20,7 +19,7 @@ all: check $(MANS)
 .PHONY: all ps pdf check clean
 
 check:
-	$(Q) for B in $(ASCIIDOC) $(A2X) $(XMLTO); do	\
+	$(Q) for B in $(ASCIIDOC) $(XMLTO); do	\
 		$$B --version > /dev/null || exit 1;	\
 	done
 

test/others/bers/Makefile

@@ -9,7 +9,6 @@ endif
 export E Q
 
 ASCIIDOC	:= asciidoc
-A2X		:= a2x
 XMLTO		:= xmlto
 
 SRC		+= bers.txt