Fix compile warnings on Mac.

src/cdigipeater.c

@@ -49,7 +49,7 @@
 #include <stdio.h>
 #include <ctype.h>	/* for isdigit, isupper */
 #include "regex.h"
-#include <sys/unistd.h>
+#include <unistd.h>
 
 #include "ax25_pad.h"
 #include "cdigipeater.h"

src/demod_psk.c

@@ -129,7 +129,8 @@ static inline float convolve (const float *__restrict__ data, const float *__res
 	float sum = 0.0;
 	int j;
 
-#pragma GCC ivdep
+//Does pragma make any difference?  Annoying warning on Mac.
+//#pragma GCC ivdep
 	for (j=0; j<filter_size; j++) {
 	    sum += filter[j] * data[j];
 	}

src/digipeater.c

@@ -62,7 +62,7 @@
 #include <stdio.h>
 #include <ctype.h>	/* for isdigit, isupper */
 #include "regex.h"
-#include <sys/unistd.h>
+#include <unistd.h>
 
 #include "ax25_pad.h"
 #include "digipeater.h"

src/multi_modem.c

@@ -91,7 +91,7 @@
 #include <string.h>
 #include <assert.h>
 #include <stdio.h>
-#include <sys/unistd.h>
+#include <unistd.h>
 
 #include "ax25_pad.h"
 #include "textcolor.h"