build: split profiler and gtk widgets into separate libraries

This will make it easier to support installing just sysprof-cli and the
sysprofd helper daemon on systems where GTK is not feasible or necessary.
This does not, however, do that. It simply gets things broken up into
pieces.

data/Makefile.am

@@ -7,7 +7,9 @@ desktopdir = $(datadir)/applications
 desktop_DATA = org.gnome.Sysprof2.desktop
 
 pkgconfigdir = $(libdir)/pkgconfig
-pkgconfig_DATA = sysprof-$(API_VERSION).pc
+pkgconfig_DATA = \
+	sysprof-$(API_VERSION).pc \
+	sysprof-ui-$(API_VERSION).pc
 
 gsettings_SCHEMAS = org.gnome.sysprof2.gschema.xml
 

data/sysprof-ui.pc.in

@@ -0,0 +1,11 @@
+prefix=@prefix@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${exec_prefix}/include
+
+Name: libsysprof-ui-@API_VERSION@
+Description: The sysprof library containing reusable GTK widgets
+Version: @VERSION@
+Libs: -L${libdir} -lsysprof-ui-@API_VERSION@
+Cflags: -I${includedir}/sysprof-@API_VERSION@
+Requires: gio-2.0 gtk+-3.0 sysprof-@API_VERSION@

data/sysprof.pc.in

@@ -4,8 +4,8 @@ libdir=${exec_prefix}/lib
 includedir=${exec_prefix}/include
 
 Name: libsysprof-@API_VERSION@
-Description: The sysprof library for integrating profiling into IDEs
+Description: The sysprof profiler library
 Version: @VERSION@
 Libs: -L${libdir} -lsysprof-@API_VERSION@
 Cflags: -I${includedir}/sysprof-@API_VERSION@
-Requires: gio-2.0 gtk+-3.0
+Requires: gio-2.0