Fix a couple of bugs in the C test template.

scripts/build.c.tests/build.tests

@@ -12,7 +12,7 @@ then
     echo "Building test programs..."
     do_cmd mkdir -p obj/tests || return 1
 
-    for SRC in src/@NAME@/*.cpp
+    for SRC in src/@NAME@/*.c
     do
         TEST="obj/tests/$(basename ${SRC} | sed -e 's,.c$,,')"
         MODIFIED=0

scripts/build.c.tests/template

@@ -6,7 +6,7 @@
 */
 
 @TEST_HEADERS@
-#include <iostream>
+#include <stdio.h>