File airspyhf-fix-libm-linking.patch of Package airspyhf

diff --git a/libairspyhf/src/CMakeLists.txt b/libairspyhf/src/CMakeLists.txt
index 2ab698b..21be9ed 100644
--- a/libairspyhf/src/CMakeLists.txt
+++ b/libairspyhf/src/CMakeLists.txt
@@ -63,7 +63,7 @@ set_target_properties(airspyhf PROPERTIES CLEAN_DIRECT_OUTPUT 1)
 set_target_properties(airspyhf-static PROPERTIES CLEAN_DIRECT_OUTPUT 1)
 
 # Dependencies
-target_link_libraries(airspyhf ${LIBUSB_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT})
+target_link_libraries(airspyhf ${LIBUSB_LIBRARIES} ${CMAKE_THREAD_LIBS_INIT} m)
    
 # For cygwin just force UNIX OFF and WIN32 ON
 if( ${CYGWIN} )