libsysprof-capture: Replace G_BEGIN_DECLS with SYSPROF_BEGIN_DECLS

It does the same job, but doesn’t require GLib.

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

Helps: #40

src/libsysprof-capture/sysprof-capture-reader.h

@@ -59,9 +59,10 @@
 #include <stdbool.h>
 
 #include "sysprof-capture-types.h"
+#include "sysprof-macros.h"
 #include "sysprof-version-macros.h"
 
-G_BEGIN_DECLS
+SYSPROF_BEGIN_DECLS
 
 typedef struct _SysprofCaptureReader SysprofCaptureReader;
 
@@ -150,4 +151,4 @@ bool                                sysprof_capture_reader_read_file_fd        (
                                                                                 int                        fd);
 
 
-G_END_DECLS
+SYSPROF_END_DECLS