build: add -Dlibsysprof option

This gets us closer to being able to only build the capture static library

meson_options.txt

@@ -3,6 +3,9 @@
 # server scenarios.
 option('enable_gtk', type: 'boolean')
 
+# Disable libsysprof/ui (in situations you only want sysprof-capture)
+option('libsysprof', type: 'boolean')
+
 # Optionally compile sysprofd, which is needed to get elevated privileges.
 # You only really want to ignore this if you are running from a container
 # and are talking to a host daemon. Also, if you're compiling for something

src/libsysprof-ui/meson.build

@@ -1,4 +1,4 @@
-if get_option('enable_gtk')
+if get_option('enable_gtk') and get_option('libsysprof')
 
 libsysprof_ui_public_sources = [
   'sysprof-aid.c',

src/libsysprof/meson.build

@@ -1,3 +1,5 @@
+if get_option('libsysprof')
+
 libsysprof_c_args = [ '-DSYSPROF_COMPILATION' ]
 
 libsysprof_public_sources = [
@@ -127,3 +129,5 @@ pkgconfig.generate(
 )
 
 install_headers(libsysprof_public_headers, subdir: sysprof_header_subdir)
+
+endif

src/sysprof/meson.build

@@ -1,4 +1,4 @@
-if get_option('enable_gtk')
+if get_option('enable_gtk') and get_option('libsysprof')
 
 sysprof_sources = [
   'sysprof.c',