scripts: simplify including for generator

Uses included .c file as primary header includer.

scripts/generator-internals.c

@@ -1,6 +1,8 @@
 // This file contains the unit testable parts of
 // lvm2_activation_generator_systemd_red_hat
 
+#include "device_mapper/all.h"
+
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>

scripts/lvm2_activation_generator_systemd_red_hat.c

@@ -12,29 +12,9 @@
  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
-#include <ctype.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>		/* For PATH_MAX for musl libc */
-#include <stdarg.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-#include <syslog.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
-#include "configure.h"
-#include "device_mapper/all.h"
-
-//----------------------------------------------------------------
-
 // Code in this file gets included in the unit tests.
 #include "generator-internals.c"
 
-//----------------------------------------------------------------
 // Logging
 
 #define KMSG_DEV_PATH		"/dev/kmsg"

test/unit/activation-generator_t.c

@@ -15,8 +15,6 @@
 #include "units.h"
 #include "scripts/generator-internals.c"
 
-#include "device_mapper/all.h"
-
 //----------------------------------------------------------------
 
 static void _error(const char *format, ...)