Relax dxc version macro tests (#2676)

The existing DXC version macro test is hitting problems in some esoteric
build cases that have different version values. This restricts the tests
to just determine that the macro is defined for now. When we can decide
what form these version macros should take, they'll be adapted to the
new expectations.

tools/clang/test/HLSLFileCheck/hlsl/preprocessor/version_defines/target_version_vertex.hlsl

@@ -14,21 +14,21 @@ float4 main(float4 pos : IN) : OUT
   float4 outPos = pos;
 
   // Will need to change if there's ever a major version bump
-#if defined(__DXC_VERSION_MAJOR) && __DXC_VERSION_MAJOR == 1
+#if defined(__DXC_VERSION_MAJOR)// && __DXC_VERSION_MAJOR == 1 // FIXME: excluded for xbtools builds
   x += 1;
 #else
   x -= 1;
 #endif
 
   // Minor version is expected to change fairly frequently. So be conservative
-#if defined(__DXC_VERSION_MINOR) && __DXC_VERSION_MINOR >= 0 && __DXC_VERSION_MINOR < 50
+#if defined(__DXC_VERSION_MINOR)// && __DXC_VERSION_MINOR >= 0 && __DXC_VERSION_MINOR < 50 // FIXME: excluded for xbtools builds
   x += 1;
 #else
   x -= 1;
 #endif
 
   // Release is either based on the year/month or set to zero for dev builds
-#if defined(__DXC_VERSION_RELEASE) && (__DXC_VERSION_RELEASE == 0 ||  __DXC_VERSION_RELEASE > 1900)
+#if defined(__DXC_VERSION_RELEASE)// && (__DXC_VERSION_RELEASE == 0 ||  __DXC_VERSION_RELEASE > 1900) // FIXME: excluded for xbtools builds
   x += 1;
 #else
   x -= 1;
@@ -37,7 +37,7 @@ float4 main(float4 pos : IN) : OUT
   // The last number varies a lot. In a dev build, Release is 0, and this number
   // is the total number of commits since the beginning of the project.
   // which can be expected to be more than 1000 at least.
-#if defined(__DXC_VERSION_COMMITS) && (__DXC_VERSION_RELEASE > 0 ||  __DXC_VERSION_COMMITS > 1000)
+#if defined(__DXC_VERSION_COMMITS)// && (__DXC_VERSION_RELEASE > 0 ||  __DXC_VERSION_COMMITS > 1000) // FIXME: excluded for xbtools builds
   x += 1;
 #else
   x -= 1;