package/plplot: remove deprecated configs

Cairo SVG is compiled with PNG. Cairo PS, and Cairo PDF have been merged
into Cairo zlib.

Signed-off-by: Nayab Sayed <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>

Author: ItsNayabSD

package/plplot/Config.in

@@ -1,8 +1,5 @@
 config BR2_PACKAGE_PLPLOT
 	bool "plplot"
-	select BR2_PACKAGE_CAIRO_PDF if BR2_PACKAGE_CAIRO
-	select BR2_PACKAGE_CAIRO_PS if BR2_PACKAGE_CAIRO
-	select BR2_PACKAGE_CAIRO_SVG if BR2_PACKAGE_CAIRO
 	help
 	  PLplot is a cross-platform software package for creating scientific plots.