[sysprof] build: only install sysprof-ui-2.pc if we build the UI

[Christian Hergert <chergert src gnome org>]

commit aaba2b6a4f5bf7b94eb7b483eba0042acc3a495d
Author: Christian Hergert <chergert redhat com>
Date:   Mon Aug 22 19:24:05 2016 -0700

    build: only install sysprof-ui-2.pc if we build the UI
    
    This fixes an error were a pkg-config check could succeed for the UI
    being installed when the gtk library was not built.

 data/Makefile.am |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/data/Makefile.am b/data/Makefile.am
index 5d0fa1d..dd38dac 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -7,9 +7,10 @@ desktopdir = $(datadir)/applications
 desktop_DATA = org.gnome.Sysprof2.desktop
 
 pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = \
-       sysprof-$(API_VERSION).pc \
-       sysprof-ui-$(API_VERSION).pc
+pkgconfig_DATA = sysprof-$(API_VERSION).pc
+if ENABLE_GTK
+pkgconfig_DATA += sysprof-ui-$(API_VERSION).pc
+endif
 
 gsettings_SCHEMAS = org.gnome.sysprof2.gschema.xml