Add missing stdio.h include for asprintf

Without that fix we have the following with clang and
-Wimplicit-function-declaration when building with Guix:
    network.c:219:2: warning: implicit declaration of function 'asprintf'
    is invalid in C99 [-Wimplicit-function-declaration]
        asprintf(&registration[0], "%d", status);
        ^

The definition of _GNU_SOURCE is required to remove the warning, and it is
also mentioned in the asprintf man in the SYNOPSIS:
    SYNOPSIS
           #define _GNU_SOURCE         /* See feature_test_macros(7) */
           #include <stdio.h>

           int asprintf(char **strp, const char *fmt, ...);
    [...]

With that fix, libsamsung-ril still compiles fine without any warnings
under Replicant 6.0.

Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>

4 files changed, 9 insertions, 0 deletions

diff --git a/data.c b/data.c
index dd39926..247b00d 100644
--- a/data.c
+++ b/data.c
@@ -18,6 +18,8 @@
  * along with Samsung-RIL.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
+#include <stdio.h>
 #include <stdlib.h>
 #include <arpa/inet.h>
 
diff --git a/misc.c b/misc.c
index e9ec767..bece1c1 100644
--- a/misc.c
+++ b/misc.c
@@ -18,6 +18,8 @@
  * along with Samsung-RIL.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
+#include <stdio.h>
 #include <stdlib.h>
 
 #define LOG_TAG "RIL"
diff --git a/network.c b/network.c
index 1ce903e..e24be5e 100644
--- a/network.c
+++ b/network.c
@@ -21,6 +21,8 @@
  * along with Samsung-RIL.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
+#include <stdio.h>
 #include <stdlib.h>
 #include <ctype.h>
 
diff --git a/ss.c b/ss.c
index 51aa46d..15d2b55 100644
--- a/ss.c
+++ b/ss.c
@@ -18,6 +18,9 @@
  * along with Samsung-RIL.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
+#include <stdio.h>
+
 #define LOG_TAG "RIL-SS"
 #include <utils/Log.h>