Include RtMidi sources as a git sub-module from fork at https://github.com/SpotlightKid/rtmidi

Signed-off-by: Christopher Arndt <[email protected]>

Author: SpotlightKid

.gitmodules

@@ -0,0 +1,4 @@
+[submodule "src/rtmidi"]
+	path = src/rtmidi
+	url = https://github.com/SpotlightKid/rtmidi.git
+	branch = python-rtmidi

setup.py

@@ -69,10 +69,10 @@ def run(self):
 
 # Set up options for compiling the _rtmidi Extension
 if cythonize:
-    sources = [join(SRC_DIR, "_rtmidi.pyx"), join(SRC_DIR, "RtMidi.cpp")]
+    sources = [join(SRC_DIR, "_rtmidi.pyx"), join(SRC_DIR, "rtmidi", "RtMidi.cpp")]
 elif exists(join(SRC_DIR, "_rtmidi.cpp")):
     cythonize = lambda x: x  # noqa
-    sources = [join(SRC_DIR, "_rtmidi.cpp"), join(SRC_DIR, "RtMidi.cpp")]
+    sources = [join(SRC_DIR, "_rtmidi.cpp"), join(SRC_DIR, "rtmidi", "RtMidi.cpp")]
 else:
     print("""\
 Could not import Cython. Cython >= 0.28 is required to compile the Cython
@@ -84,7 +84,7 @@ def run(self):
     sys.exit(1)
 
 define_macros = []
-include_dirs = [SRC_DIR]
+include_dirs = [join(SRC_DIR, "rtmidi")]
 libraries = []
 library_dirs = []
 extra_link_args = []