File fix-cmake.patch of Package warsow

diff -Nur warsow_21_sdk/source/source/ref_gl/CMakeLists.txt new/source/source/ref_gl/CMakeLists.txt
--- warsow_21_sdk/source/source/ref_gl/CMakeLists.txt	2016-03-26 20:22:10.000000000 +0100
+++ new/source/source/ref_gl/CMakeLists.txt	2016-08-16 18:15:59.189284644 +0200
@@ -55,6 +55,12 @@
     endif()
 endif()
 
+if(UNIX)
+    set(MATH_LIBRARY m)
+else()
+    set(MATH_LIBRARY)
+endif()
+
 add_library(ref_gl SHARED ${REF_GL_HEADERS} ${REF_GL_COMMON_SOURCES} ${REF_GL_PLATFORM_SOURCES})
-target_link_libraries(ref_gl PRIVATE ${JPEG_LIBRARIES} ${PNG_LIBRARIES} ${REF_GL_PLATFORM_LIBRARIES})
+target_link_libraries(ref_gl PRIVATE ${JPEG_LIBRARIES} ${PNG_LIBRARIES} ${REF_GL_PLATFORM_LIBRARIES} ${MATH_LIBRARY})
 qf_set_output_dir(ref_gl libs)