Fix minor compilation issues on CentOS.

- ensure size_t is defined when compiling xprintf.h
- declare overlay_route_record as a union field in overlay_route_record to avoid alignment issues
- set the result of fwrite and fputs
- support slightly older git version

mdp_client.h

@@ -106,7 +106,10 @@ struct overlay_mdp_data_frame {
   uint16_t payload_length;
   int queue;
   int ttl;
-  unsigned char payload[MDP_MTU-100];
+  union{
+    unsigned char payload[MDP_MTU-100];
+    struct overlay_route_record route_record;
+  };
 };
 
 struct overlay_mdp_error {

network_cli.c

@@ -459,7 +459,7 @@ static int app_route_print(const struct cli_parsed *parsed, struct cli_context *
     
     int ofs=0;
     while(ofs + sizeof(struct overlay_route_record) <= rx.out.payload_length){
-      struct overlay_route_record *p=(struct overlay_route_record *)&rx.out.payload[ofs];
+      struct overlay_route_record *p=&rx.out.route_record;
       ofs+=sizeof(struct overlay_route_record);
       
       if (p->reachable==REACHABLE_NONE)

overlay_mdp.c

@@ -1145,7 +1145,7 @@ static int routing_table(struct subscriber *subscriber, void *context)
   overlay_mdp_frame reply;
   bzero(&reply, sizeof(overlay_mdp_frame));
   
-  struct overlay_route_record *r=(struct overlay_route_record *)&reply.out.payload;
+  struct overlay_route_record *r=&reply.out.route_record;
   reply.packetTypeAndFlags=MDP_TX;
   reply.out.payload_length=sizeof(struct overlay_route_record);
   r->sid = subscriber->sid;

tfw_createfile.c

@@ -113,8 +113,8 @@ int main(int argc, char **argv)
     unsigned remain = size - offset - 1;
     if (remain > sizeof buf)
       remain = sizeof buf;
-    fwrite(buf, remain, 1, stdout);
+    int r=fwrite(buf, remain, 1, stdout);
-    fputc('\n', stdout);
+    r=fputc('\n', stdout);
     offset += remain + 1;
     if (bounce <= n || bounce >= bouncemax)
       bouncedelta *= -1;

version_string.sh

@@ -154,7 +154,7 @@ case "$error" in
 *[Nn]'o tags can describe'* | \
 *[Cc]'annot describe'* )
    if [ -n "$default_tag" ]; then
-      commit=$(git rev-list --abbrev-commit --max-count 1 ${refspec:-HEAD})
+      commit=$(git rev-list --abbrev-commit --max-count=1 ${refspec:-HEAD})
       count=$(( $(git rev-list ${refspec:-HEAD} | wc -l) - 1 ))
       echo "$default_tag-$count-g$commit$dirty"
       exit 0

xprintf.h

@@ -62,6 +62,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 
 #include <stdarg.h>
+#include <unistd.h>
 
 typedef void CONTEXT_VPRINTF(void *context, const char *fmt, va_list);