[build] __BEGIN/__END_CDECLS around many headers

tools/bootimage.h

@@ -23,8 +23,11 @@
 
 #pragma once
 
+#include <compiler.h>
 #include <lib/bootimage_struct.h>
 
+__BEGIN_CDECLS;
+
 typedef struct bootimage bootimage;
 
 bootimage *bootimage_init(void);
@@ -41,3 +44,5 @@ bootentry_file *bootimage_add_file(
 void bootimage_done(bootimage *img);
 
 int bootimage_write(bootimage *img, int fd);
+
+__END_CDECLS;

tools/liblkboot.h

@@ -23,6 +23,10 @@
 
 #pragma once
 
+#include <compiler.h>
+
+__BEGIN_CDECLS;
+
 // connect to host, issue cmd:args, and if txfd != -1, send the contents
 // of that file as the command payload
 int lkboot_txn(const char *host, const char *cmd, int txfd, const char *args);
@@ -30,3 +34,5 @@ int lkboot_txn(const char *host, const char *cmd, int txfd, const char *args);
 // return number of bytes of data the last txn resulted in and if nonzero
 // set *ptr = the buffer (which remains valid until next lkboot_txn())
 unsigned lkboot_get_reply(void **ptr);
+
+__END_CDECLS;

tools/network.h

@@ -22,12 +22,15 @@
  */
 #pragma once
 
+#include <compiler.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <netdb.h>
 
+__BEGIN_CDECLS;
+
 int udp_listen(in_addr_t addr, unsigned port, int shared);
 int udp_connect(in_addr_t addr, unsigned port);
 
@@ -35,3 +38,5 @@ int tcp_listen(in_addr_t addr, unsigned port);
 int tcp_connect(in_addr_t addr, unsigned port);
 
 in_addr_t lookup_hostname(const char *hostname);
+
+__END_CDECLS;