libxml2-ptest: improve reproducibility

Remove various build host references from libxml-ptest package.

[YOCTO #11997]

(From OE-Core rev: c2b53ec8d15b97da73353623c0cfe287f74992bf)

Signed-off-by: Juro Bystricky <juro.bystricky@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/libxml/libxml2_2.9.4.bb

@@ -89,6 +89,17 @@ do_install_ptest () {
 		grep -lrZ '#!/usr/bin/python' ${D}${PTEST_PATH}/python |
 			xargs -0 sed -i -e 's|/usr/bin/python|${USRBINPATH}/${PYTHON_PN}|'
 	fi
+	#Remove build host references from various Makefiles
+	find "${D}${PTEST_PATH}" -name Makefile -type f -exec \
+	    sed -i \
+	    -e 's,--sysroot=${STAGING_DIR_TARGET},,g' \
+	    -e 's|${DEBUG_PREFIX_MAP}||g' \
+	    -e 's:${HOSTTOOLS_DIR}/::g' \
+	    -e 's:${RECIPE_SYSROOT_NATIVE}::g' \
+	    -e 's:${RECIPE_SYSROOT}::g' \
+	    -e 's:${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}::g' \
+	    -e '/^RELDATE/d' \
+	    {} +
 }
 
 do_install_append_class-native () {