opensp: Fix hard path in native nsgmls.

This relocation issues caused following bug and introduce one partial fix bb024d:
[YOCTO #1440]

But the environment val hacking is not working all the time, as nsgmsl may
append wrong path in some case. This fix use search directory "-D" as solution.
And more important, change the iputils' way to make doc: Use the sysid in
current directory instead of parent directory, as "../" is also appended to the
search directory then lead searching failure.

(From OE-Core rev: a5aeb873b943300e18493031ffa9e9f8ab56c2d2)

Signed-off-by: Zhai Edwin <edwin.zhai@intel.com>
CC: Saul Would <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/opensp/opensp_1.5.bb

@@ -5,7 +5,7 @@ SECTION = "libs"
 LICENSE = "BSD"
 LIC_FILES_CHKSUM = "file://COPYING;md5=641ff1e4511f0a87044ad42f87cb1045"
 
-PR = "r1"
+PR = "r2"
 
 # At -Os it encounters calls to some inline functions which are then
 # not found in any other objects with gcc 4.5
@@ -42,6 +42,13 @@ do_install_append() {
 	ln -sf osx sgml2xml
 }
 
+do_install_append_virtclass-native() {
+	for util in nsgmls sgmlnorm spam spcat spent sx; do
+		create_cmdline_wrapper ${D}/${bindir}/$util \
+		    -D ${sysconfdir}/sgml
+	done
+}
+
 FILES_${PN} += "${datadir}/OpenSP/"
 
 BBCLASSEXTEND = "native"