omx: always define ENABLE_ST_OMX_{BELLAGIO,TIZONIA}

We're trying to be -Wundef clean so that we can turn it on (and
eventually make it an error).

Note that the OMX code already used `#if ENABLE_ST_OMX_BELLAGIO` instead
of #ifdef; I could've changed these, but the point of -Wundef is to
catch typos, so we might as well make the change the right way.

Fixes: 83d4a5d5aea5a8a05be2 "st/omx/tizonia: Add H.264 decoder"
Fixes: b2f2236dc565dd1460f0 "st/omx/tizonia: Add H.264 encoder"
Fixes: c62cf1f165919bc74296 "st/omx/tizonia/h264d: Add EGLImage support"
Cc: Gurkirpal Singh <gurkirpal204@gmail.com>
Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>
diff --git a/meson.build b/meson.build
index 0a94eec..871b0d8 100644
--- a/meson.build
+++ b/meson.build
@@ -503,7 +503,6 @@
     'libomxil-bellagio', required : _omx == 'bellagio'
   )
   if dep_omx.found()
-    pre_args += '-DENABLE_ST_OMX_BELLAGIO'
     with_gallium_omx = 'bellagio'
   endif
 endif
@@ -518,7 +517,6 @@
       dependency('tizilheaders', required : _omx == 'tizonia'),
     ]
     if dep_omx.found() and dep_omx_other[0].found() and dep_omx_other[1].found()
-      pre_args += '-DENABLE_ST_OMX_TIZONIA'
       with_gallium_omx = 'tizonia'
     endif
   elif _omx == 'tizonia'
@@ -531,7 +529,14 @@
   with_gallium_omx = _omx
 endif
 
+pre_args += [
+  '-DENABLE_ST_OMX_BELLAGIO=' + (with_gallium_omx == 'bellagio' ? '1' : '0'),
+  '-DENABLE_ST_OMX_TIZONIA=' + (with_gallium_omx == 'tizonia' ? '1' : '0'),
+]
+
+
 omx_drivers_path = get_option('omx-libs-path')
+
 if with_gallium_omx != 'disabled'
   # Figure out where to put the omx driver.
   # FIXME: this could all be vastly simplified by adding a 'defined_variable'