Move gstfastspectrum to 3rdparty

3rdparty/gstfastspectrum/CMakeLists.txt

@@ -0,0 +1,34 @@
+cmake_minimum_required(VERSION 3.13)
+
+set(SOURCES gstfastspectrum.cpp)
+
+add_library(gstfastspectrum STATIC ${SOURCES})
+
+target_include_directories(gstfastspectrum SYSTEM PRIVATE
+  ${GLIB_INCLUDE_DIRS}
+  ${GOBJECT_INCLUDE_DIRS}
+  ${GSTREAMER_INCLUDE_DIRS}
+  ${GSTREAMER_BASE_INCLUDE_DIRS}
+  ${GSTREAMER_AUDIO_INCLUDE_DIRS}
+  ${FFTW3_INCLUDE_DIR}
+)
+
+target_include_directories(gstfastspectrum PRIVATE ${CMAKE_CURRENT_SOURCE_DIR})
+
+target_link_directories(gstfastspectrum PRIVATE
+  ${GLIB_LIBRARY_DIRS}
+  ${GOBJECT_LIBRARY_DIRS}
+  ${GSTREAMER_LIBRARY_DIRS}
+  ${GSTREAMER_BASE_LIBRARY_DIRS}
+  ${GSTREAMER_AUDIO_LIBRARY_DIRS}
+  ${FFTW3_LIBRARY_DIRS}
+)
+
+target_link_libraries(gstfastspectrum PRIVATE
+  ${GLIB_LIBRARIES}
+  ${GOBJECT_LIBRARIES}
+  ${GSTREAMER_LIBRARIES}
+  ${GSTREAMER_BASE_LIBRARIES}
+  ${GSTREAMER_AUDIO_LIBRARIES}
+  ${FFTW3_FFTW_LIBRARY}
+)