tests: Fix a few warnings.

Fix a bunch of "no previous prototype for ..." warnings exposed
by -Wmissing-prototypes.

tests/check_core.c

@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <check.h>
 #include "../libsigrok.h"
+#include "lib.h"
 
 /*
  * Check various basic init related things.

tests/check_main.c

@@ -21,14 +21,7 @@
 #include <stdlib.h>
 #include <check.h>
 #include "../libsigrok.h"
-
+#include "lib.h"
-Suite *suite_core(void);
-Suite *suite_driver_all(void);
-Suite *suite_input_all(void);
-Suite *suite_input_binary(void);
-Suite *suite_output_all(void);
-Suite *suite_strutil(void);
-Suite *suite_version(void);
 
 int main(void)
 {

tests/check_strutil.c

@@ -20,6 +20,7 @@
 
 #include <check.h>
 #include "../libsigrok.h"
+#include "lib.h"
 
 struct sr_context *sr_ctx;
 

tests/check_version.c

@@ -21,6 +21,7 @@
 #include <stdlib.h>
 #include <check.h>
 #include "../libsigrok.h"
+#include "lib.h"
 
 /*
  * Check the version number API calls and macros.

tests/lib.c

@@ -24,6 +24,7 @@
 #include <glib/gstdio.h>
 #include <check.h>
 #include "../libsigrok.h"
+#include "lib.h"
 
 /* Get a libsigrok driver by name. */
 struct sr_dev_driver *srtest_driver_get(const char *drivername)

tests/lib.h

@@ -41,4 +41,12 @@ void srtest_check_samplerate(struct sr_context *sr_ctx, const char *drivername,
 void srtest_buf_to_file(const char *filename, const uint8_t *buf, uint64_t len);
 GArray *srtest_get_enabled_logic_probes(const struct sr_dev_inst *sdi);
 
+Suite *suite_core(void);
+Suite *suite_driver_all(void);
+Suite *suite_input_all(void);
+Suite *suite_input_binary(void);
+Suite *suite_output_all(void);
+Suite *suite_strutil(void);
+Suite *suite_version(void);
+
 #endif