Remove patch as we are using our own csdr fork

csdrpizero.diff

@@ -1,11 +0,0 @@
---- Makefile	2018-11-23 13:39:24.740234633 +0000
-+++ Makefile.armv6	2018-11-23 13:49:52.312391638 +0000
-@@ -33,7 +33,7 @@
- PARAMS_NEON = -mfloat-abi=hard -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mvectorize-with-neon-quad -funsafe-math-optimizations -Wformat=0 -DNEON_OPTS
- #tnx Jan Szumiec for the Raspberry Pi support
- PARAMS_RASPI = -mfloat-abi=hard -mcpu=arm1176jzf-s -mfpu=vfp -funsafe-math-optimizations -Wformat=0
--PARAMS_ARM = $(if $(call cpufeature,BCM2708,dummy-text),$(PARAMS_RASPI),$(PARAMS_NEON))
-+PARAMS_ARM = $(if $(call cpufeature,ARMv6,dummy-text),$(PARAMS_RASPI),$(PARAMS_NEON))
- PARAMS_SIMD = $(if $(call cpufeature,sse,dummy-text),$(PARAMS_SSE),$(PARAMS_ARM))
- PARAMS_LOOPVECT = -O3 -ffast-math -fdump-tree-vect-details -dumpbase dumpvect
- PARAMS_LIBS = -g -lm -lrt -lfftw3f -DUSE_FFTW -DLIBCSDR_GPL -DUSE_IMA_ADPCM