cmake HAVE_BG_SYNTH_THREAD examples

zynaddsubfx/zynaddsubfx src/CMakeLists.txt :126 

add_definitions(-DHAVE_BG_SYNTH_THREAD=1)

zynaddsubfx/zynaddsubfx src/CMakeLists.txt :128 

add_definitions(-DHAVE_BG_SYNTH_THREAD=0)