tests: Remove no-spirv support from framework

The early ICDs that accepted GLSL with this header on the front are long
dead.
diff --git a/tests/vktestframework.cpp b/tests/vktestframework.cpp
index 992de35..693aba0 100644
--- a/tests/vktestframework.cpp
+++ b/tests/vktestframework.cpp
@@ -140,7 +140,6 @@
 VkTestFramework::~VkTestFramework() {}
 
 // Define all the static elements
-bool VkTestFramework::m_use_glsl = false;
 bool VkTestFramework::m_canonicalize_spv = false;
 bool VkTestFramework::m_strip_spv = false;
 bool VkTestFramework::m_do_everything_spv = false;
@@ -158,9 +157,7 @@
     int i, n;
 
     for (i = 1, n = 1; i < *argc; i++) {
-        if (optionMatch("--no-SPV", argv[i]))
-            m_use_glsl = true;
-        else if (optionMatch("--strip-SPV", argv[i]))
+        if (optionMatch("--strip-SPV", argv[i]))
             m_strip_spv = true;
         else if (optionMatch("--canonicalize-SPV", argv[i]))
             m_canonicalize_spv = true;