Vulkan rules relaxed for glslang C interface

- Added vulkan_rules_relaxed flag to glslang_input_t to turn on Vulkan
  rules relaxed during shader creation.

glslang/CInterface/glslang_c_interface.cpp

@@ -343,6 +343,10 @@ GLSLANG_EXPORT glslang_shader_t* glslang_shader_create(const glslang_input_t* in
     shader->shader->setEnvTarget(c_shader_target_language(input->target_language),
                                  c_shader_target_language_version(input->target_language_version));
 
+    if (input->vulkan_rules_relaxed) {
+        shader->shader->setEnvInputVulkanRulesRelaxed();
+    }
+
     return shader;
 }
 

glslang/Include/glslang_c_interface.h

@@ -166,6 +166,7 @@ typedef struct glslang_input_s {
     glslang_profile_t default_profile;
     int force_default_version_and_profile;
     int forward_compatible;
+    int vulkan_rules_relaxed;
     glslang_messages_t messages;
     const glslang_resource_t* resource;
 } glslang_input_t;