stlink-org#1216 refactoring of common.c

File divided to some parts. Functions with "flash" in names extracted to common_flash.c, with "option" extracted to option.c etc.
Removed unnecessary headers.
Removed one single function which was used nowhere.
And so on.
Project built under Windows and seems to be working.

src/common_flash.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stlink.h>
 #include <unistd.h>
+#include <string.h>
 #include "calculate.h"
 #include "common_flash.h"
 #include "map_file.h"

src/flashloader.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <stlink.h>
 #include "common_flash.h"
 

src/map_file.c

@@ -1,10 +1,17 @@
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <md5.h>
+#include <unistd.h> // for close
 #include <stlink.h>
+#include <logging.h>
+
 
 #include "map_file.h"
 
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
 #ifndef MAX_FILE_SIZE
 #define MAX_FILE_SIZE (1<<20) // 1 GB max file size
 #endif

src/option.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <stlink.h>
 #include "common_flash.h"
 #include "map_file.h"

src/read_write.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <string.h>
 #include <stlink.h>
 
 // Endianness