Brings back checks for older MESA versions.

Reverts commits 6e65547 and 479df8e.
These commits caused the build to fail on DragonFlyBSD.

mesa-libs 21.3.9 is not by any means ancient, it is only 3 years old and
it is still receiving critical bug fixes, and most importantly it is
still being used on DragonFlyBSD, also these are relatively small and
harmless checks.

Signed-off-by: b-aaz <b-aazbsd.proton.me>

configure.ac

@@ -125,6 +125,16 @@ else
 fi
 AM_CONDITIONAL(GLAMOR, test x$GLAMOR != xno)
 
+AC_CHECK_DECL(GBM_BO_USE_LINEAR,
+	      [AC_DEFINE(HAVE_GBM_BO_USE_LINEAR, 1, [Have GBM_BO_USE_LINEAR])], [],
+	      [#include <stdlib.h>
+	       #include <gbm.h>])
+
+AC_CHECK_DECL(GBM_BO_USE_FRONT_RENDERING,
+	      [AC_DEFINE(HAVE_GBM_BO_USE_FRONT_RENDERING, 1, [Have GBM_BO_USE_FRONT_RENDERING])], [],
+	      [#include <stdlib.h>
+	       #include <gbm.h>])
+
 CPPFLAGS="$SAVE_CPPFLAGS"
 
 # Checks for headers/macros for byte swapping

src/amdgpu_bo_helper.c

@@ -82,13 +82,17 @@ struct amdgpu_buffer *amdgpu_alloc_pixmap_bo(ScrnInfoPtr pScrn, int width,
 		if (usage_hint & AMDGPU_CREATE_PIXMAP_SCANOUT)
 			bo_use |= GBM_BO_USE_SCANOUT;
 
+#ifdef HAVE_GBM_BO_USE_FRONT_RENDERING
 		if (usage_hint & AMDGPU_CREATE_PIXMAP_FRONT)
 			bo_use |= GBM_BO_USE_FRONT_RENDERING;
+#endif
 
+#ifdef HAVE_GBM_BO_USE_LINEAR
 		if (usage_hint == CREATE_PIXMAP_USAGE_SHARED ||
 		    (usage_hint & AMDGPU_CREATE_PIXMAP_LINEAR)) {
 			bo_use |= GBM_BO_USE_LINEAR;
 		}
+#endif
 
 		pixmap_buffer->bo.gbm = gbm_bo_create(info->gbm, width, height,
 						      gbm_format,

src/amdgpu_kms.c

@@ -1316,11 +1316,13 @@ static Bool AMDGPUPreInitAccel_KMS(ScrnInfoPtr pScrn)
 	if (xf86ReturnOptValBool(info->Options, OPTION_ACCEL, TRUE)) {
 		AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(pScrn);
 		Bool use_glamor = TRUE;
+#ifdef HAVE_GBM_BO_USE_LINEAR
 		const char *accel_method;
 
 		accel_method = xf86GetOptValString(info->Options, OPTION_ACCEL_METHOD);
 		if ((accel_method && !strcmp(accel_method, "none")))
 			use_glamor = FALSE;
+#endif
 
 #ifdef DRI2
 		info->dri2.available = ! !xf86LoadSubModule(pScrn, "dri2");