Obtain pffft as a git submodule instead of wget'ing from vcvrack.com.

.gitmodules

@@ -28,3 +28,6 @@
 [submodule "dep/filesystem"]
 	path = dep/filesystem
 	url = https://github.com/gulrak/filesystem.git
+[submodule "dep/pffft"]
+	path = dep/pffft
+	url = https://bitbucket.org/jpommier/pffft.git

dep/Makefile

@@ -238,12 +238,6 @@ $(osdialog): $(wildcard osdialog/*.h)
 	mkdir -p include
 	cp $^ include/
 
-pffft:
-	$(WGET) "https://vcvrack.com/downloads/dep/pffft.zip"
-	$(SHA256) pffft.zip fd3ebe4f3843675a79912167a4e74415ed0ad302ed8adc90e1af23a7c67654b4
-	$(UNZIP) pffft.zip
-	rm pffft.zip
-
 $(pffft): | pffft
 	mkdir -p include
 	cp pffft/*.h include/
@@ -258,7 +252,7 @@ $(ghcfilesystem): filesystem/include/ghc
 
 # Helpers
 
-src: glew-2.1.0 glfw jansson-2.12 speexdsp-SpeexDSP-1.2rc3 openssl-1.1.1d curl-7.66.0 zstd-1.4.5 libarchive-3.4.3 rtmidi-4.0.0 rtaudio nanovg nanosvg oui-blendish osdialog pffft
+src: glew-2.1.0 glfw jansson-2.12 speexdsp-SpeexDSP-1.2rc3 openssl-1.1.1d curl-7.66.0 zstd-1.4.5 libarchive-3.4.3 rtmidi-4.0.0 rtaudio nanovg nanosvg oui-blendish osdialog
 
 clean:
 	git clean -fdx

dep/pffft

@@ -0,0 +1 @@
+Subproject commit 74d7261be17cf659d5930d4830609406bd7553e3