[sysprof] build: make help optional

[Christian Hergert <chergert src gnome org>]

commit 9fcb759b52b1c74d5cf5683ea9472c45863f1a30
Author: Christian Hergert <chergert redhat com>
Date:   Tue May 7 22:57:21 2019 -0700

    build: make help optional
    
    This isn't necessary for command line tooling and such.

 help/meson.build  | 8 +++++---
 meson_options.txt | 3 +++
 2 files changed, 8 insertions(+), 3 deletions(-)
---
diff --git a/help/meson.build b/help/meson.build
index 5e0393b..ec3e5b6 100644
--- a/help/meson.build
+++ b/help/meson.build
@@ -1,3 +1,5 @@
-gnome.yelp('sysprof',
-  sources: ['index.page', 'introduction.page', 'profiling.page', 'faq.page', 'legal.xml'],
-)
+if get_option('help')
+  gnome.yelp('sysprof',
+    sources: ['index.page', 'introduction.page', 'profiling.page', 'faq.page', 'legal.xml'],
+  )
+endif
diff --git a/meson_options.txt b/meson_options.txt
index b04a0d4..fd0c9d1 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -23,3 +23,6 @@ option('systemdunitdir', type: 'string',
 option('debugdir', type: 'string',
   description: 'Look for global separate debug info in this path'
 )
+
+# If Yelp documentation should be installed
+option('help', type: 'boolean')