openal: add upstream patch to fix FPU related build failures

Fixes:

  http://autobuild.buildroot.net/results/b57/b5777a0ed33f6bb7a5fc0486ea21ecef58615dac/build-end.log

Signed-off-by: André Hentschel <nerv@dawncrow.de>
[Thomas:
 - download patch directly from Github.
 - add reference to autobuilder failure.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/openal/openal.hash

@@ -1,2 +1,3 @@
 # Locally calculated
 sha256	a341f8542f1f0b8c65241a17da13d073f18ec06658e1a1606a8ecc8bbc2b3314	openal-soft-1.17.2.tar.bz2
+sha256	9c9040269376aba77b1277bbae0f055aee535e14ad4a3ab4e66e39830504e83f	27916ce3db023454a0295ee63ea196fbc246674c.patch

package/openal/openal.mk

@@ -7,6 +7,8 @@
 OPENAL_VERSION = 1.17.2
 OPENAL_SOURCE = openal-soft-$(OPENAL_VERSION).tar.bz2
 OPENAL_SITE = http://kcat.strangesoft.net/openal-releases
+OPENAL_PATCH = \
+	https://github.com/kcat/openal-soft/commit/27916ce3db023454a0295ee63ea196fbc246674c.patch
 OPENAL_LICENSE = LGPLv2+
 OPENAL_LICENSE_FILES = COPYING
 OPENAL_INSTALL_STAGING = YES