cmake: Make Freetype mandatory for non-headless builds

OpenClonk fails to start without Freetype support, because it cannot
load required fonts.

CMakeLists.txt

@@ -856,9 +856,8 @@ if(NOT WIN32)
 endif()
 
 if(NOT USE_CONSOLE)
-	find_package(Freetype)
+	find_package(Freetype REQUIRED)
 	include_directories(${FREETYPE_INCLUDE_DIRS})
-	SET(HAVE_FREETYPE ${FREETYPE_FOUND} CACHE INTERNAL "Rename of FREETYPE_FOUND for config.h")
 endif()
 
 # FINDLIB works the same as find_library, but also marks the resulting var as

config.h.cmake

@@ -13,9 +13,6 @@
 /* Whether FMOD shall be used */
 #cmakedefine HAVE_FMOD 1
 
-/* Define to 1 if you have FreeType2. */
-#cmakedefine HAVE_FREETYPE 1
-
 /* Define to 1 if you have the <history.h> header file. */
 #cmakedefine HAVE_HISTORY_H 1
 

config.h.in

@@ -18,9 +18,6 @@
 /* The backtrace function is declared in execinfo.h and works */
 #undef HAVE_EXECINFO_H
 
-/* Define to 1 if you have FreeType2. */
-#undef HAVE_FREETYPE
-
 /* Define to 1 if you have the <history.h> header file. */
 #undef HAVE_HISTORY_H
 

configure.ac

@@ -281,7 +281,6 @@ if test $enable_console = no; then
       AC_MSG_ERROR([Freetype not found.])
     fi
   ])
-  AC_DEFINE(HAVE_FREETYPE, 1, [Define to 1 if you have FreeType2.])
 fi
 
 # X11, Xrandr