PortAudio: Enable build on macOS/arm64

Makefile

@@ -100,7 +100,7 @@ ifeq ($(call has, VIRTIOSND), 1)
 portaudio/Makefile:
 	git submodule update --init portaudio
 $(PORTAUDIOLIB): portaudio/Makefile
-	cd $(dir $<) && ./configure --without-sndio
+	cd $(dir $<) && LDFLAGS="" ./configure --without-sndio
 	$(MAKE) -C $(dir $<)
 main.o: $(PORTAUDIOLIB)
 
@@ -168,12 +168,12 @@ DTC ?= dtc
 E :=
 S := $E $E
 
-# During boot process, he emulator manually manages the growth of ticks to 
-# suppress RCU CPU stall warnings. Thus, we need an target time to set the 
+# During boot process, the emulator manually manages the growth of ticks to
+# suppress RCU CPU stall warnings. Thus, we need an target time to set the
 # increment of ticks. According to Using RCU’s CPU Stall Detector[1], the
-# grace period for RCU CPU stalls is typically set to 21 seconds. 
-# By dividing this value by two as the expected completion time, we can 
-# provide a sufficient buffer to reduce the impact of errors and avoid 
+# grace period for RCU CPU stalls is typically set to 21 seconds.
+# By dividing this value by two as the expected completion time, we can
+# provide a sufficient buffer to reduce the impact of errors and avoid
 # RCU CPU stall warnings.
 # [1] docs.kernel.org/RCU/stallwarn.html#config-rcu-cpu-stall-timeout
 CFLAGS += -D SEMU_BOOT_TARGET_TIME=10
@@ -213,6 +213,6 @@ distclean: clean
 	$(Q)$(RM) riscv-harts.dtsi
 	$(Q)$(RM) minimal.dtb
 	$(Q)$(RM) Image rootfs.cpio
-	$(Q)$(RM) ext4.img 
+	$(Q)$(RM) ext4.img
 
 -include $(deps)