pidgin/pidgin

Remove purple_markup_get_css_property and purple_markup_is_rtl which are no longer used

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/1823/
syntax: glob
.*.swp
.DS_Store
.flatpak-builder
*.pyc
*~
\#*\#
syntax: regexp
^build(.+)?\/
win32-install-dir(\.release)?
po\/pidgin\.pot$
^subprojects\/.+\/