package/libssh2: disable rpath

Bumping libssh2 to 1.11.0 with buildroot commit
af87ad197caf434936fe239f2718fd17b60fcb8b
causes build errors with libcurl due to "-R" being added to libssh2.pc.

Quoting autobuilder build-end.log

checking for recv... no
configure: error: Unable to link function recv

Quoting autobuilder libcurl-8.1.2/config.log

arc-buildroot-linux-uclibc-gcc.br_real: error: unrecognized command-line option '-R'

Fixes:
http://autobuild.buildroot.net/results/78f/78ffda92d51f8abdbcef93f968ace432d0d44979/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libssh2/libssh2.mk

@@ -11,7 +11,7 @@ LIBSSH2_LICENSE = BSD
 LIBSSH2_LICENSE_FILES = COPYING
 LIBSSH2_CPE_ID_VENDOR = libssh2
 LIBSSH2_INSTALL_STAGING = YES
-LIBSSH2_CONF_OPTS = --disable-examples-build
+LIBSSH2_CONF_OPTS = --disable-examples-build --disable-rpath
 
 ifeq ($(BR2_PACKAGE_LIBSSH2_MBEDTLS),y)
 LIBSSH2_DEPENDENCIES += mbedtls