Remove O_TRUNC undef

This problem was fixed upstream by renaming O_TRUNC to OID_TRUNC.

Change-Id: I6ea9317af856d09fcb8e43d159839b344e0ced58
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/vulkan-cts/+/593605
Reviewed-by: Craig Stout <cstout@google.com>
diff --git a/external/vulkancts/modules/vulkan/spirv_assembly/vktSpvAsmFloatControlsTests.cpp b/external/vulkancts/modules/vulkan/spirv_assembly/vktSpvAsmFloatControlsTests.cpp
index e8aa540..d20e58f 100644
--- a/external/vulkancts/modules/vulkan/spirv_assembly/vktSpvAsmFloatControlsTests.cpp
+++ b/external/vulkancts/modules/vulkan/spirv_assembly/vktSpvAsmFloatControlsTests.cpp
@@ -38,11 +38,6 @@
 #include <limits>
 #include <fenv.h>
 
-// <string> may include fcntl.h which #defines O_TRUNC in musl
-#ifdef O_TRUNC
-#undef O_TRUNC
-#endif
-
 namespace vkt
 {
 namespace SpirVAssembly