gzip_1.8.bb: improve reproducibility

Remove build host references from gzip-ptest package.

(From OE-Core rev: 3c9fec29a8151a669950e2c8e7835a8602efa664)

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-extended/gzip/gzip_1.8.bb

@@ -27,6 +27,10 @@ do_install_ptest() {
             -e 's/^AWK = ..*/AWK = awk/'                \
             -e 's/^srcdir = ..*/srcdir = \./'           \
             -e 's/^Makefile: ..*/Makefile: /'           \
+            -e 's,--sysroot=${STAGING_DIR_TARGET},,g'   \
+            -e 's|${DEBUG_PREFIX_MAP}||g' \
+            -e 's:${HOSTTOOLS_DIR}/::g'                 \
+            -e 's:${BASE_WORKDIR}/${MULTIMACH_TARGET_SYS}::g' \
             ${B}/tests/Makefile > ${D}${PTEST_PATH}/src/tests/Makefile
 }