virglrender: Fix endianness check on musl

Seen to fail on musl/mips, this fixes the check to be linux specific
which means it can detect the endianness for musl correctly

(From OE-Core rev: c9559685ebcfb0303fc072c99b3d518427fc5a82)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-graphics/virglrenderer/virglrenderer/0001-gallium-Expand-libc-check-to-be-platform-OS-check.patch

@@ -0,0 +1,36 @@
+From 3d30df8d8ccb919733b5339b2a82474305b83998 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Tue, 6 Aug 2019 01:19:48 +0000
+Subject: [PATCH] gallium: Expand libc check to be platform OS check
+
+endianness on musl based systems can also be detected in same way as
+glibc, therefore check for __linux__ define instead of __GLIBC__
+
+Fixes build on musl/mips
+
+| ../../../../git/src/gallium/include/pipe/p_config.h:171:2: error: #error Unknown Endianness
+| #error Unknown Endianness
+|  ^~~~~
+
+Upstream-Status: Pending
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ src/gallium/include/pipe/p_config.h | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/gallium/include/pipe/p_config.h b/src/gallium/include/pipe/p_config.h
+index d603681..71cdf49 100644
+--- a/src/gallium/include/pipe/p_config.h
++++ b/src/gallium/include/pipe/p_config.h
+@@ -130,7 +130,7 @@
+  * Endian detection.
+  */
+ 
+-#ifdef __GLIBC__
++#ifdef __linux__
+ #include <endian.h>
+ 
+ #if __BYTE_ORDER == __LITTLE_ENDIAN
+-- 
+2.17.1
+

meta/recipes-graphics/virglrenderer/virglrenderer_0.7.0.bb

@@ -9,6 +9,7 @@ SRCREV = "402c228861c9893f64cffbbcb4cb23044b8c721c"
 SRC_URI = "git://anongit.freedesktop.org/virglrenderer \
            file://0001-vtest-add-missing-includes.patch \
            file://0001-Makefile.am-explicitly-link-with-libdrm.patch \
+           file://0001-gallium-Expand-libc-check-to-be-platform-OS-check.patch \
            "
 
 S = "${WORKDIR}/git"