build: install into PoB runtime/ instead of bundling font data

Font bitmaps and SimpleGraphic.cfg already live in PoB's runtime/
directory (the same as on Windows), so there is no need to duplicate
them in this repository.

Remove data/SimpleGraphic/ and drop the install(DIRECTORY) rule.
The natural install prefix is now the PoB runtime/ directory, where
the launcher's SG_BASE_PATH logic finds the fonts automatically.

Author: velomeister

CMakeLists.txt

@@ -418,5 +418,4 @@ if (CMAKE_SYSTEM_NAME MATCHES "Linux")
     add_executable(PathOfBuilding linux/launcher.c)
     target_link_libraries(PathOfBuilding PRIVATE ${CMAKE_DL_LIBS})
     install(TARGETS PathOfBuilding RUNTIME DESTINATION ".")
-    install(DIRECTORY data/SimpleGraphic DESTINATION ".")
 endif()