Changes needed to get gd2 tests working.

This change needs to be further evaluated to see if it should be passed

upstream.

--- tests/gdimageline/CMakeLists.txt.orig 2014-12-10 16:08:04.845700212 -0800

+++ tests/gdimageline/CMakeLists.txt 2014-12-10 16:07:38.129451205 -0800

@@ -7,6 +7,6 @@

FOREACH(test_name ${TESTS_FILES})

add_executable(${test_name} "${test_name}.c")

- target_link_libraries (${test_name} gdTest ${GD_LIB})

+ target_link_libraries (${test_name} gdTest ${GD_LIB} "-lm")

ADD_TEST(${test_name} ${EXECUTABLE_OUTPUT_PATH}/${test_name})

ENDFOREACH(test_name)