Add missing #include's previously pulled in by libntech

With libntech's headers no longer pulling in platform.h, we need
to add it together with some other headers to some places in the
codebase.

cf-monitord/proc_net_parsing.c

@@ -23,6 +23,7 @@
 */
 
 #include <stdio.h>
+#include <string.h>						/* strchr() */
 #include <arpa/inet.h>
 
 #include <logging.h>

libpromises/extensions.c

@@ -22,8 +22,13 @@
   included file COSL.txt.
 */
 
+#include <platform.h>
 #include <enterprise_extension.h>
 
+#include <stdio.h>						/* sscanf() */
+#include <stdlib.h>						/* getenv() */
+#include <string.h>						/* strcmp() */
+
 #include <known_dirs.h>
 #include <misc_lib.h>
 

libpromises/extensions_template.c.pre

@@ -26,6 +26,9 @@ BEGIN_MARKER // Do not include this file directly! Build process should replace
 
 #include <XextensionX_extension.h>
 
+#include <stdlib.h>             /* getenv() */
+#include <string.h>             /* strerror() */
+
 #include <logging.h>
 
 #include <pthread.h>

libpromises/extensions_template.h.pre

@@ -91,6 +91,7 @@ BEGIN_MARKER // Do not include this file directly! Build process should replace
 #ifndef xEXTENSIONx_EXTENSION_H
 #define xEXTENSIONx_EXTENSION_H
 
+#include <platform.h>
 #include <extensions.h>
 
 #include <logging.h>

libpromises/shared_lib.c

@@ -24,9 +24,12 @@
 
 #ifndef __MINGW32__
 
+#include <platform.h>
 #include <shared_lib.h>
 #include <logging.h>
 #include <mutex.h>
+#include <pthread.h>
+#include <sys/stat.h>
 
 #include <dlfcn.h>