package/execline: add option to build multicall binary

Since version 2.9.2.0, with another bugfix in 2.9.4.0, execline can
be built as a multicall binary, similar to busybox. According to
the author[1], this results in space savings of 66-87% on Linux.

[1]: https://skarnet.org/software/execline/execline.html

Signed-off-by: J. Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/execline/Config.in

@@ -10,3 +10,12 @@ config BR2_PACKAGE_EXECLINE
 	  essentially useful inside an execlineb script.
 
 	  http://skarnet.org/software/execline/
+
+if BR2_PACKAGE_EXECLINE
+
+config BR2_PACKAGE_EXECLINE_MULTICALL
+	bool "execline multicall binary"
+	help
+	  Build execline as a multicall binary to save disk space.
+
+endif

package/execline/execline.mk

@@ -19,6 +19,7 @@ EXECLINE_CONF_OPTS = \
 	--with-dynlib=$(STAGING_DIR)/lib \
 	--with-lib=$(STAGING_DIR)/lib/skalibs \
 	$(if $(BR2_STATIC_LIBS),,--disable-allstatic) \
+	$(if $(BR2_PACKAGE_EXECLINE_MULTICALL),--enable-multicall,) \
 	$(SHARED_STATIC_LIBS_OPTS)
 
 define EXECLINE_CONFIGURE_CMDS