Allow Embree to build with custom compiler flags

Undefine all __AVX* defines to prevent hitting code paths
that result in linker errors.

Change-Id: I60d8a77c449607762bd5449ead21180744c17dff
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

Author: alpqr

src/3rdparty/embree/common/sys/platform.h

@@ -376,3 +376,11 @@ namespace embree
   }
 
 }
+
+// Qt's bundled build enforces EMBREE_TARGET_SSE2, it must not hit the AVX code paths
+#undef __AVX512VL__
+#undef __AVX512F__
+#undef __AVX2__
+#undef __AVXI__
+#undef __AVX__
+#undef __SSE4_2__

src/3rdparty/embree/patches/0001-Allow-Embree-to-build-with-custom-compiler-flags.patch

@@ -0,0 +1,32 @@
+From bcdf980cd1293e10e3f661e847f41b4e7ec3a4e4 Mon Sep 17 00:00:00 2001
+From: Laszlo Agocs <laszlo.agocs@qt.io>
+Date: Fri, 3 Jun 2022 10:35:15 +0200
+Subject: [PATCH] Allow Embree to build with custom compiler flags
+
+Undefine all __AVX* defines to prevent hitting code paths
+that result in linker errors.
+
+Change-Id: I60d8a77c449607762bd5449ead21180744c17dff
+---
+ src/3rdparty/embree/common/sys/platform.h | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/src/3rdparty/embree/common/sys/platform.h b/src/3rdparty/embree/common/sys/platform.h
+index 7ba5a19f..78d8afce 100644
+--- a/src/3rdparty/embree/common/sys/platform.h
++++ b/src/3rdparty/embree/common/sys/platform.h
+@@ -376,3 +376,11 @@ namespace embree
+   }
+ 
+ }
++
++// Qt's bundled build enforces EMBREE_TARGET_SSE2, it must not hit the AVX code paths
++#undef __AVX512VL__
++#undef __AVX512F__
++#undef __AVX2__
++#undef __AVXI__
++#undef __AVX__
++#undef __SSE4_2__
+-- 
+2.36.1.windows.1
+