meson/pps: Check if libdrm exists to compile pps

For Turnip with KGSL we may have perffeto enabled but we don't
have libdrm.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Reviewed-by: Hyunjun Ko <zzoon@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17173>

src/tool/meson.build

@@ -3,7 +3,7 @@
 #
 # SPDX-License-Identifier: MIT
 
-if with_perfetto
+if with_perfetto and dep_libdrm.found()
   subdir('pps')
 endif