pango: Update to version 1.52.0

pango: Update to version 1.52.0

- Update from version 1.50.13 to 1.52.0
- Update of rootfile
- Changelog
    1.52.0
	- Add pango_font_map_reload_font
	- Improve formatting of font sizes
    1.51.2
	- Build improvements on Windows
	- Use single fontconfig thread
	- Fix problems with spaces at line ends
	- Allow custom fonts on Windows
	- pango-viewer: Fix hint-metrics options
	- Pangofont: Add properties
    1.51.0
	- itemize: Improve script itemization
	- build: Check for cairo DWrite dependency
	- win32: Fix various issues and crashes
	- layout: Add a missing switch case
    1.50.14
	- Fix underline thickness in scaled contexts

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>