Modules: Remove unused CheckLibraryExists.list.in file

This file template for `CheckLibraryExists` has not been used since
commit 5902279ebc (Fix modules for recent changes, 2002-09-25,
v2.4.0~5118).

Modules/CheckLibraryExists.lists.in

@@ -1,8 +0,0 @@
-PROJECT(CHECK_LIBRARY_EXISTS)
-
-
-ADD_DEFINITIONS(-DCHECK_FUNCTION_EXISTS=${CHECK_LIBRARY_EXISTS_FUNCTION})
-LINK_DIRECTORIES(${CHECK_LIBRARY_EXISTS_LOCATION})
-ADD_EXECUTABLE(CheckLibraryExists ${CHECK_LIBRARY_EXISTS_SOURCE})
-TARGET_LINK_LIBRARIES(CheckLibraryExists ${CHECK_LIBRARY_EXISTS_LIBRARY})
-