Fix build without MTD support

handlers/raw_handler and corelib/installer does not need flash.h.
corelib/stream_interface and core/swupdate should include flash.h only
conditionally.

This fixes build errors if HAVE_MTD is not set and libmtd is not available:

In file included from include/swupdate.h:25:0,
                 from handlers/raw_handler.c:33:
include/flash.h:26:24: fatal error: mtd/libmtd.h: No such file or directory

Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>

core/swupdate.c

@@ -43,7 +43,9 @@
 #include "network_interface.h"
 #include "handler.h"
 #include "installer.h"
+#ifdef CONFIG_MTD
 #include "flash.h"
+#endif
 #include "lua_util.h"
 #include "mongoose_interface.h"
 #include "network_ipc.h"
@@ -62,12 +64,14 @@ static pthread_t network_daemon;
 /* Tree derived from the configuration file */
 static struct swupdate_cfg swcfg;
 
+#ifdef CONFIG_MTD
 /* Global MTD configuration */
 static struct flash_description flashdesc;
 
 struct flash_description *get_flash_info(void) {
 	return &flashdesc;
 }
+#endif
 
 static struct option long_options[] = {
 	{"verbose", no_argument, NULL, 'v'},
@@ -375,7 +379,9 @@ int main(int argc, char **argv)
 	int ac = 0;
 #endif
 
+#ifdef CONFIG_MTD
 	memset(&flashdesc, 0, sizeof(flashdesc));
+#endif
 	memset(main_options, 0, sizeof(main_options));
 	memset(image_url, 0, sizeof(image_url));
 	strcpy(main_options, "vhi:se:l:");

corelib/installer.c

@@ -38,7 +38,6 @@
 #include "util.h"
 #include "swupdate.h"
 #include "installer.h"
-#include "flash.h"
 #include "handler.h"
 #include "cpiohdr.h"
 #include "parsers.h"

corelib/stream_interface.c

@@ -44,7 +44,9 @@
 #include "swupdate.h"
 #include "util.h"
 #include "handler.h"
+#ifdef CONFIG_MTD
 #include "flash.h"
+#endif
 #include "parsers.h"
 #include "network_ipc.h"
 #include "network_interface.h"

handlers/raw_handler.c

@@ -29,10 +29,8 @@
 #include <errno.h>
 #include <string.h>
 
-#include <mtd/mtd-user.h>
 #include "swupdate.h"
 #include "handler.h"
-#include "flash.h"
 #include "util.h"
 
 void raw_handler(void);

include/swupdate.h

@@ -22,7 +22,6 @@
 
 #include <sys/types.h>
 #include "bsdqueue.h"
-#include "flash.h"
 #include "globals.h"
 
 typedef enum {