meson: Simplify condition

If `softisp_enabled` is false, then `subdir_done()` is called above.

Signed-off-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/software_isp/meson.build

@@ -16,7 +16,7 @@ libcamera_internal_sources += files([
     'swstats_cpu.cpp',
 ])
 
-if softisp_enabled and gles_headless_enabled
+if gles_headless_enabled
     config_h.set('HAVE_DEBAYER_EGL', 1)
     libcamera_internal_sources += files([
         '../egl.cpp',