repo structure: move headers to new include/microdns folder

With that change, libmicrodns can be used as a meson subproject
without requiring the parent project to use a different include
path.

This also makes the examples more readily copypastable, as the
include is switched from `#include "microdns.h"` to
`#include <microdns/microdns.h`, which is how external compilation
units are expected to perform the inclusion.

In addition, this also removes the unneeded compat.h inclusion from
the announce example, this has been tested and is known to compile
on Windows with mingw / MSYS2.

compat/compat.c

@@ -25,7 +25,7 @@
 #include <string.h>
 
 #include "compat.h"
-#include "utils.h"
+#include "microdns/utils.h"
 
 #if defined (__unix__) || defined (__APPLE__)
 struct timeval os_deadline = {

compat/inet.c

@@ -25,7 +25,7 @@
 #include <string.h>
 
 #include "compat.h"
-#include "utils.h"
+#include "microdns/utils.h"
 
 #if defined (_WIN32) && !defined(HAVE_INET_NTOP)
 const char *

compat/poll.c

@@ -25,7 +25,7 @@
 #include <string.h>
 
 #include "compat.h"
-#include "utils.h"
+#include "microdns/utils.h"
 
 #ifndef HAVE_POLL
 int poll(struct pollfd *fds, unsigned nfds, int timeout)

examples/announce.c

@@ -19,8 +19,7 @@
 #include <signal.h>
 #include <string.h>
 
-#include "microdns.h"
-#include "compat.h"
+#include <microdns/microdns.h>
 
 volatile sig_atomic_t sigflag = 0;
 

examples/main.c

@@ -20,7 +20,7 @@
 #include <unistd.h>
 #include <signal.h>
 
-#include "microdns.h"
+#include <microdns/microdns.h>
 
 volatile sig_atomic_t sigflag = 0;
 

meson.build

@@ -146,7 +146,7 @@ libcompat_sources = [
     'compat/poll.c',
 ]
 
-incdirs = include_directories('src', 'compat')
+incdirs = include_directories('include', 'compat')
 
 libcompat = static_library('compat', libcompat_sources,
     include_directories: incdirs,
@@ -160,8 +160,8 @@ libmicrodns_sources = [
 ]
 
 libmicrodns_headers = [
-    'src/microdns.h',
-    'src/rr.h',
+    'include/microdns/microdns.h',
+    'include/microdns/rr.h',
 ]
 
 install_headers(libmicrodns_headers, subdir: 'microdns')

src/mdns.c

@@ -35,8 +35,8 @@
 #include <stdint.h>
 
 #include "compat.h"
-#include "utils.h"
-#include "microdns.h"
+#include "microdns/utils.h"
+#include "microdns/microdns.h"
 
 #define MDNS_PKT_MAXSZ 4096 // read/write buffer size
 

src/rr.c

@@ -32,9 +32,9 @@
 #include <stdlib.h>
 #include <stdint.h>
 
-#include "utils.h"
-#include "microdns.h"
-#include "rr.h"
+#include "microdns/utils.h"
+#include "microdns/microdns.h"
+#include "microdns/rr.h"
 
 typedef const uint8_t *(*rr_reader)(const uint8_t *, size_t *, const uint8_t *, struct rr_entry *);
 typedef size_t (*rr_writer)(uint8_t *, const struct rr_entry *);