doc/Makefile: avoid GNU extentions, be tidy

This commit does three things. One is avoiding GNU extentions since they aren't
used elsewhere. It also tells xml2rfc to cache in side the build directory to
avoid writing outside our own space when building. Finally, it removes the .chk
build since that doesn't appear needed.

Author: swills

doc/Makefile.am

@@ -9,12 +9,15 @@ BUILT_SOURCES += protocol-binary.txt protocol-binary-range.txt
 MOSTLYCLEANFILES = protocol-binary.txt protocol-binary-range.txt
 endif
 
-%.txt: %.full
-	@XML2RFC@ $< $@
+protocol-binary.txt: $(.TARGET:R).full
+	@XML2RFC@ -c @abs_builddir@ $(.TARGET:R).full $@
 
-%.chk: %.xml xml2rfc/rfc2629-refchk.xsl
-	@XSLTPROC@ xml2rfc/rfc2629-refchk.xsl $< >$@
+protocol-binary-range.txt: $(.TARGET:R).full
+	@XML2RFC@ -c @abs_builddir@ $(.TARGET:R).full $@
 
-%.full: %.xml xml2rfc/rfc2629-noinc.xsl
-	@XSLTPROC@ xml2rfc/rfc2629-noinc.xsl $< >$@
+protocol-binary.full: $(.TARGET:R).xml xml2rfc/rfc2629-noinc.xsl
+	@XSLTPROC@ --nonet xml2rfc/rfc2629-noinc.xsl $(.TARGET:R).xml > $@
+
+protocol-binary-range.full: $(.TARGET:R).xml xml2rfc/rfc2629-noinc.xsl
+	@XSLTPROC@ --nonet xml2rfc/rfc2629-noinc.xsl $(.TARGET:R).xml > $@