attr: Disable attr.test on musl

the error message in musl based systems is
EXPECTED: Operation not supported
RECIEVED: Not supported

The test is then marked as failed due to this.
Ignore this test on musl

(From OE-Core rev: b29ce2f571fa38646e5d2000a502eed040cae1c0)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-support/attr/attr.inc

@@ -48,6 +48,10 @@ do_install_ptest() {
 	cp -rf ${S}/test/ ${D}${PTEST_PATH}
 }
 
+do_install_ptest:append:libc-musl() {
+        sed -i -e 's|f: Operation n|f: N|g' ${D}${PTEST_PATH}/test/attr.test
+}
+
 RDEPENDS:${PN}-ptest = "attr \
                         bash \
                         coreutils \