h3, h5, grGlideInit: return if _GlideRoot.hwConfig.num_sst == 0:

In case of error, _GlideInitEnvironment() calls GrErrorCallback() which is
supposed to be a noreturn function, but it really is not for non-windows..
Eww...

glide2x/h3/glide/src/diglide.c

@@ -318,6 +318,13 @@ GR_DIENTRY(grGlideInit, void, (void))
   gdbg_error_set_callback(_grErrorCallback);
 #endif
 
+  /* In case of error, _GlideInitEnvironment() calls GrErrorCallback() which is
+   * supposed to be a noreturn function, but it really is not for non-windows..
+   * Eww... */
+  if (!_GlideRoot.hwConfig.num_sst) {
+    return;
+  }
+
 #if USE_PACKET_FIFO && (WTF_P_COMDEX || WTF_P_COMDEX_RESET)
   /* Work around for apps that call some grXXX state call
    * before calling grSstWinOpen which inits the command fifo.  

glide3x/h3/glide3/src/diglide.c

@@ -351,6 +351,13 @@ GR_DIENTRY(grGlideInit, void, (void))
   gdbg_error_set_callback(_grErrorCallback);
 #endif
 
+  /* In case of error, _GlideInitEnvironment() calls GrErrorCallback() which is
+   * supposed to be a noreturn function, but it really is not for non-windows..
+   * Eww... */
+  if (!_GlideRoot.hwConfig.num_sst) {
+    return;
+  }
+
   if (_GlideRoot.initialized) {
     initThreadStorage();
     initCriticalSection();

glide3x/h5/glide3/src/diglide.c

@@ -353,6 +353,13 @@ GR_DIENTRY(grGlideInit, void, (void))
   GDBG_ERROR_SET_CALLBACK(_grErrorCallback);
 #endif
 
+  /* In case of error, _GlideInitEnvironment() calls GrErrorCallback() which is
+   * supposed to be a noreturn function, but it really is not for non-windows..
+   * Eww... */
+  if (!_GlideRoot.hwConfig.num_sst) {
+    return;
+  }
+
   if (_GlideRoot.initialized) {
     /* allocate the TLS index */
     /* [koolsmoky] According to Microsoft, the TLS index must be allocated