pidgin/pidgin

Make it so only libpurple can directly include libpurple header files.

This is part of our on going effort to make it easier to develop against libpurple as well as making our filenames not part of our api.

Make it so only libpurple can directly include libpurple header files.

Testing Done:
Just a normal compile to make sure everything builds again.

Reviewed at https://reviews.imfreedom.org/r/8/
##############################################################################
# General Options
option('extraversion', type : 'string',
description : 'extra version number to be displayed in Help->About and --help (for packagers)')
option('doc', type : 'boolean', value : false,
description : 'build documentation with gtk-doc')
option('glib-errors-trace', type : 'boolean', value : false,
description : 'print backtraces for glib errors')
option('introspection', type : 'feature',
description : 'build introspection data')
option('nettle', type : 'feature',
description : 'enable Nettle support')
option('nls', type : 'boolean', value : true,
description : 'enable installation of translation files')
option('pixmaps-install', type : 'boolean', value : true,
description : 'enable installation of pixmap files - Pidgin still needs them!')
##############################################################################
# Libpurple Options
option('farstream', type : 'feature',
description : 'compile with farstream support')
option('gstreamer', type : 'feature',
description : 'compile with GStreamer audio support')
option('gstreamer-video', type : 'feature',
description : 'compile with GStreamer 1.0 Video Overlay support')
option('kwallet', type : 'feature',
description : 'enable KWallet support')
option('plugins', type : 'boolean', value : true,
description : 'compile plugins')
option('secret-service', type : 'feature',
description : 'enable Secret Service support')
option('vv', type : 'feature',
description : 'compile with voice and video support')
##############################################################################
# Protocol Plugins
option('dynamic-prpls', type : 'string', value: 'all',
description : 'specify which protocols to build dynamically')
option('avahi', type : 'feature',
description : 'compile with avahi (required for Bonjour support)')
option('cyrus-sasl', type : 'feature',
description : 'enable Cyrus SASL support for XMPP/IRC')
option('krb4', type : 'boolean', value : false,
description : 'compile Zephyr plugin with Kerberos 4 support')
option('libgadu', type : 'feature',
description : 'compile with libgadu (required for GaduGadu support)')
option('meanwhile', type : 'feature',
description : 'compile with meanwhile')
option('silc', type : 'feature',
description : 'compile with SILC plugin')
option('zephyr', type : 'feature',
description : 'compile Zephyr plugin against external libzephyr')
##############################################################################
# Pidgin Options
option('gtkui', type : 'boolean', value : true,
description : 'compile with GTK+ user interface')
option('cap', type : 'boolean', value : false,
description : 'compile with Contact Availability Prediction plugin')
option('console-logging', type : 'boolean', value : false,
description : 'compile with console logging support')
option('gestures', type : 'boolean', value : true,
description : 'compile with the gestures plugin')
option('gevolution', type : 'feature', value : 'disabled',
description : 'compile with the Evolution plugin')
option('unity-integration', type : 'feature',
description : 'compile with support for unity integration plugin')
##############################################################################
# Finch Options
option('consoleui', type : 'boolean', value : true,
description : 'compile with console user interface')
option('x', type : 'boolean', value : true)