package/crun: fix musl and uclibc-ng builds

Fix the following musl and uclibc-ng build failures raised since the
addition of the package in commit
530d6f661e506a4774b7236cb93d65f669adbc92:

configure: error: *** argp functions not found - install libargp or argp_standalone

Fixes:
 - http://autobuild.buildroot.org/results/55b283fa46a797253193fb752638ba88597a416b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/crun/Config.in

@@ -1,5 +1,6 @@
 config BR2_PACKAGE_CRUN
 	bool "crun"
+	select BR2_PACKAGE_ARGP_STANDALONE if BR2_TOOLCHAIN_USES_UCLIBC || BR2_TOOLCHAIN_USES_MUSL
 	select BR2_PACKAGE_YAJL # libocispec
 	help
 	  crun is a fast and low-memory OCI Container Runtime in C.

package/crun/crun.mk

@@ -15,6 +15,10 @@ CRUN_CPE_ID_VENDOR = crun_project
 CRUN_AUTORECONF = YES
 CRUN_CONF_OPTS = --disable-embedded-yajl
 
+ifeq ($(BR2_PACKAGE_ARGP_STANDALONE),y)
+CRUN_DEPENDENCIES += argp-standalone
+endif
+
 ifeq ($(BR2_PACKAGE_LIBCAP),y)
 CRUN_DEPENDENCIES += libcap
 CRUN_CONF_OPTS += --enable-caps