build: add hexagonrpcd_verbose option

There is extra debug logging in the code which can be activated by
`meson configure build -Dc_args=-DHEXAGONRPC_VERBOSE`. This may be
difficult to trigger, since it requires -D twice in the same argument.
Add the hexagonrpcd_verbose option to make it easier to configure the
extra logging.

This can be activated with `-Dhexagonrpcd_verbose=true` and deactivated
with `-Dhexagonrpcd_verbose=false`.

meson.build

@@ -5,6 +5,10 @@ client_target = get_option('libexecdir') / 'hexagonrpc'
 
 cflags = ['-Wall', '-Wextra', '-Wpedantic', '-Wno-unused-parameter']
 
+if get_option('hexagonrpcd_verbose')
+  cflags += '-DHEXAGONRPC_VERBOSE'
+endif
+
 subdir('libhexagonrpc')
 subdir('hexagonrpcd')
 subdir('chrecd')

meson.options

@@ -0,0 +1,2 @@
+option('hexagonrpcd_verbose', type : 'boolean', value : true,
+  description : 'Compile hexagonrpcd with extra logging for each remote method invocation')