libsysprof-capture: Use C11 types instead of GLib types

This is an almost entirely mechanical* conversion from (for example)
`gint` → `int`, `guint8` → `uint8_t`, etc.

It is not entirely complete, as many GLib functions are still used in
libsysprof-capture, which necessitate some use of GLib types.

It also avoids renaming `gboolean` → `bool` as that’s a slightly more
controversial change which will happen in the following commit.

*Code was manually realigned afterwards.

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Helps: #40

src/libsysprof-capture/sysprof-platform.c

@@ -77,7 +77,7 @@
  * Returns: An fd if successful; otherwise -1 and errno is set.
  */
 int
-sysprof_memfd_create (const gchar *name)
+sysprof_memfd_create (const char *name)
 {
 #ifdef __NR_memfd_create
   if (name == NULL)
@@ -116,7 +116,7 @@ sysprof_memfd_create (const gchar *name)
  *
  * Since: 3.36
  */
-gsize
+size_t
 sysprof_getpagesize (void)
 {
   return _sysprof_getpagesize ();