docbook-xsl-stylesheets: add perl to RDEPENDS

This solves the following warning:

docbook-xsl-stylesheets-1.78.1: docbook-xsl-stylesheets requires /usr/bin/perl,
/bin/bash, but no providers in its RDEPENDS [file-rdeps]

(From OE-Core rev: d7a277b35bcc67050046c76fb70412101679a545)

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/docbook-xml/docbook-xsl-stylesheets/docbook-xsl-stylesheets-no-bashism-in-docbook-xsl-up.patch

@@ -0,0 +1,24 @@
+docbook-xsl-stylesheets: no bashism in docbook-xsl-update
+
+The checkbashisms shows there is no bashism, so use /bin/sh.
+
+Upstream-Status: Pending
+
+Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
+---
+ tools/bin/docbook-xsl-update | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/tools/bin/docbook-xsl-update b/tools/bin/docbook-xsl-update
+index aba0016..cc73aa2 100755
+--- a/tools/bin/docbook-xsl-update
++++ b/tools/bin/docbook-xsl-update
+@@ -1,4 +1,4 @@
+-#!/bin/bash
++#!/bin/sh
+ # vim: number
+ 
+ # docbook-xsl-update - Update environment to latest docbook-xsl snapshot
+-- 
+1.9.1
+

meta/recipes-devtools/docbook-xml/docbook-xsl-stylesheets_1.78.1.bb

@@ -5,6 +5,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=a6eeeed43d498c22a835382533356462"
 
 SRC_URI = "${SOURCEFORGE_MIRROR}/docbook/docbook-xsl-${PV}.tar.bz2 \
            file://docbook-xsl.xml \
+           file://docbook-xsl-stylesheets-no-bashism-in-docbook-xsl-up.patch \
 "
 
 SRC_URI[md5sum] = "6dd0f89131cc35bf4f2ed105a1c17771"
@@ -63,5 +64,6 @@ docbook_xsl_stylesheets_sysroot_preprocess () {
     sed -i -e "s|file:///usr/share/xml|file://${datadir}/xml|g" ${SYSROOT_DESTDIR}${sysconfdir}/xml/docbook-xsl.xml
 }
 
+RDEPENDS_${PN} += "perl"
 FILES_${PN} = "${datadir}/xml/* ${sysconfdir}/xml/docbook-xsl.xml"
 FILES_${PN}-doc = "${datadir}/doc/*"