neutrino: Replace USE_NEVIS_GXA with hardware-specific macros

- Existing USE_NEVIS_GXA definitions in the build system
  (neutrino configure) can be removed.

src/driver/fb_accel.h

@@ -33,13 +33,6 @@
 #define PARTIAL_BLIT 1
 #endif
 
-#if HAVE_COOL_HARDWARE
-#ifndef BOXMODEL_APOLLO
-/* not needed -- if you don't want acceleration, don't call CFbAccel ;) */
-#define USE_NEVIS_GXA 1
-#endif
-#endif
-
 class CFbAccel
 	: public CFrameBuffer
 {

src/driver/fb_generic.h

@@ -184,7 +184,7 @@ class CFrameBuffer : public sigc::trackable
 
 		bool getActive() const;                     // is framebuffer active?
 		void setActive(bool enable);                     // is framebuffer active?
-#ifdef USE_NEVIS_GXA
+#if HAVE_COOL_HARDWARE && BOXMODEL_NEVIS
 		virtual void setupGXA() {};
 		virtual void add_gxa_sync_marker() {};
 #endif

src/driver/screenshot.cpp

@@ -77,7 +77,7 @@ bool CScreenShot::GetData()
 	bool res = false;
 
 	mutex.lock();
-#ifdef USE_NEVIS_GXA
+#if HAVE_COOL_HARDWARE && BOXMODEL_NEVIS
 	CFrameBuffer::getInstance()->setActive(false);
 #endif
 	if (videoDecoder->getBlank()) 
@@ -86,7 +86,7 @@ bool CScreenShot::GetData()
 	res = videoDecoder->GetScreenImage(pixel_data, xres, yres, get_video, get_osd, scale_to_video);
 #endif
 
-#ifdef USE_NEVIS_GXA
+#if HAVE_COOL_HARDWARE && BOXMODEL_NEVIS
 	/* sort of hack. GXA used to transfer/convert live image to RGB,
 	 * so setup GXA back */
 	CFrameBuffer::getInstance()->setupGXA();