package/ola: fix musl build

Fixes
http://autobuild.buildroot.net/results/17f/17fe88868acdbba074561da14c4417e31d506823/
http://autobuild.buildroot.net/results/d99/d99ca60cc4bf86c338fd61f9fd2de0bb9598d670/

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
[Thomas: switch to using the upstreamed Github patch.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ola/ola.hash

@@ -1,2 +1,3 @@
 # Locally calculated
 sha256 74baba18c5b62aba15e27e6b7882c6eac22043c8e7b297e4d2f6eb05dd1a33b0 ola-0.10.0.tar.gz
+sha256 32a8a7a00c7db7647710c84ed02611f2eba99669f2de4da7aceae9d4444f53a3 34999c70dcbe2d38bf13d57c9cfbdc63f0899b9a.patch

package/ola/ola.mk

@@ -6,7 +6,7 @@
 
 OLA_VERSION = 0.10.0
 OLA_SITE = $(call github,OpenLightingProject,ola,$(OLA_VERSION))
-
+OLA_PATCH = https://github.com/OpenLightingProject/ola/commit/34999c70dcbe2d38bf13d57c9cfbdc63f0899b9a.patch
 OLA_LICENSE = LGPLv2.1+ (libola, libolacommon, Python bindings), GPLv2+ (libolaserver, olad, Python examples and tests)
 OLA_LICENSE_FILES = LICENCE GPL LGPL
 OLA_INSTALL_STAGING = YES