[sysprof] collector: add missing config.h include

[Christian Hergert <chergert src gnome org>]

commit 9ce6353ea42c4ebc94c0c6a1db8a2a0e852b081f
Author: Christian Hergert <chergert redhat com>
Date:   Fri Aug 21 13:45:50 2020 -0700

    collector: add missing config.h include
    
    This was causing symbols to not be exported when used within libsysprof.

 src/libsysprof-capture/sysprof-collector.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/libsysprof-capture/sysprof-collector.c b/src/libsysprof-capture/sysprof-collector.c
index 3476d8bd..803aa02e 100644
--- a/src/libsysprof-capture/sysprof-collector.c
+++ b/src/libsysprof-capture/sysprof-collector.c
@@ -54,6 +54,8 @@
  * SPDX-License-Identifier: BSD-2-Clause-Patent
  */
 
+#include "config.h"
+
 #include <assert.h>
 #include <errno.h>
 #include <poll.h>