cmake: remove unused variable "CLAR_RESOURCES"

Once upon a time, the `CLAR_RESOURCES` variable was intended to set
the `CLAR_RESOURCES` define. But actually, the define uses a wrong
variable name by accident, hinting that its value cannot actually be
used at all, as it is empty. Searching through the code base confirms
the guess that the define is not used at all.

Remove both the variable and definition.

CMakeLists.txt

@@ -673,9 +673,7 @@ IF (BUILD_CLAR)
 
 	SET(CLAR_FIXTURES "${CMAKE_CURRENT_SOURCE_DIR}/tests/resources/")
 	SET(CLAR_PATH "${CMAKE_CURRENT_SOURCE_DIR}/tests")
-	SET(CLAR_RESOURCES "${CMAKE_CURRENT_SOURCE_DIR}/tests/resources" CACHE PATH "Path to test resources.")
 	ADD_DEFINITIONS(-DCLAR_FIXTURE_PATH=\"${CLAR_FIXTURES}\")
-	ADD_DEFINITIONS(-DCLAR_RESOURCES=\"${TEST_RESOURCES}\")
 	ADD_DEFINITIONS(-DCLAR_TMPDIR=\"libgit2_tests\")
 
 	INCLUDE_DIRECTORIES(${CLAR_PATH})