oeqa: adding selftest-hello and use it to speed up tests

Adding a selftest version of hello world to run it in tests where no download is necessary.
Also using this in several tests to speed them up.
Using the -native version wherever possible will also speed up tests a lot.

[YOCTO #11142]

(From OE-Core rev: c3f26b63934888df0e3cd563c1c2804eb78a368e)

Signed-off-by: Thomas Roos <throos@amazon.de>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-selftest/recipes-test/selftest-hello/files/helloworld.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main(void)
+{
+	printf("Hello world!\n");
+
+	return 0;
+}

meta-selftest/recipes-test/selftest-hello/selftest-hello_1.0.bb

@@ -0,0 +1,19 @@
+DESCRIPTION = "Simple helloworld application -- selftest variant"
+SECTION = "examples"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/MIT;md5=0835ade698e0bcf8506ecda2f7b4f302"
+
+SRC_URI = "file://helloworld.c"
+
+S = "${WORKDIR}"
+
+do_compile() {
+	${CC} ${CFLAGS} ${LDFLAGS} helloworld.c -o helloworld
+}
+
+do_install() {
+	install -d ${D}${bindir}
+	install -m 0755 helloworld ${D}${bindir}
+}
+
+BBCLASSEXTEND = "native nativesdk"