[committed][gdb/testsuite] Fix implicit declaration of printf in gdb.objc/*.m

[committed][gdb/testsuite] Fix implicit declaration of printf in gdb.objc/*.m

[Tom de Vries]

Hi,

When running gdb.objc/objcdecode.exp we get:
...
objcdecode.m: In function '-[Decode multipleDef]':
objcdecode.m:14:3: warning: incompatible implicit declaration of built-in \
  function 'printf'
   printf("method multipleDef\n");
   ^~~~~~
objcdecode.m:14:3: note: include '<stdio.h>' or provide a declaration of \
  'printf'
...

Fix this in the three gdb.objc/*.m test-cases by including stdio.h.

Tested on x86_64-linux.

Committed to trunk.

Thanks,
- Tom

[gdb/testsuite] Fix implicit declaration of printf in gdb.objc/*.m

gdb/testsuite/ChangeLog:

2019-07-24  Tom de Vries  <tdevries@suse.de>

	PR testsuite/24807
	* gdb.objc/basicclass.m: Include stdio.h.
	* gdb.objc/nondebug.m: Same.
	* gdb.objc/objcdecode.m: Same.

---
 gdb/testsuite/gdb.objc/basicclass.m | 1 +
 gdb/testsuite/gdb.objc/nondebug.m   | 1 +
 gdb/testsuite/gdb.objc/objcdecode.m | 1 +
 3 files changed, 3 insertions(+)

diff --git a/gdb/testsuite/gdb.objc/basicclass.m b/gdb/testsuite/gdb.objc/basicclass.m
index 0de12db25a..d9b3f23954 100644
--- a/gdb/testsuite/gdb.objc/basicclass.m
+++ b/gdb/testsuite/gdb.objc/basicclass.m
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <objc/Object.h>
 
 @interface BasicClass: Object
diff --git a/gdb/testsuite/gdb.objc/nondebug.m b/gdb/testsuite/gdb.objc/nondebug.m
index dcbdde936c..352a71c30e 100644
--- a/gdb/testsuite/gdb.objc/nondebug.m
+++ b/gdb/testsuite/gdb.objc/nondebug.m
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <objc/Object.h>
 
 @interface NonDebug: Object
diff --git a/gdb/testsuite/gdb.objc/objcdecode.m b/gdb/testsuite/gdb.objc/objcdecode.m
index 5e99618d11..a061661ed9 100644
--- a/gdb/testsuite/gdb.objc/objcdecode.m
+++ b/gdb/testsuite/gdb.objc/objcdecode.m
@@ -1,3 +1,4 @@
+#include <stdio.h>
 #include <objc/Object.h>
 
 @interface Decode: Object