[TASK] cleanup, proto back where it should be

using custom command, no external shell hack needed

Author: hzb-ps

bact_archiver/meson.build

@@ -9,4 +9,3 @@ py.install_sources(
   pure: false,
   subdir: 'bact_archiver'
 )
-subdir('proto')

bact_archiver/proto/proto_wrap.sh

@@ -12,4 +12,5 @@ py = import('python').find_installation(pure: false)
 
 # need to build the proto generated files before
 # I can build the cython extension
+subdir('proto')
 subdir('bact_archiver')