misc: Remove the sys/types.h include from various files

We used this include for the u_int{8,16,32}_t types but we do
not need this anymore.
diff --git a/src/msgb.c b/src/msgb.c
index 8672006..d2c167a 100644
--- a/src/msgb.c
+++ b/src/msgb.c
@@ -22,7 +22,6 @@
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
-#include <sys/types.h>
 
 #include <osmocom/core/msgb.h>
 //#include <openbsc/gsm_data.h>
diff --git a/src/msgfile.c b/src/msgfile.c
index ec4434a..c13df51 100644
--- a/src/msgfile.c
+++ b/src/msgfile.c
@@ -24,7 +24,6 @@
 #include <osmocom/core/msgfile.h>
 #include <osmocom/core/talloc.h>
 
-#include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <unistd.h>
diff --git a/src/plugin.c b/src/plugin.c
index 4924e95..4d9fd31 100644
--- a/src/plugin.c
+++ b/src/plugin.c
@@ -24,7 +24,6 @@
 
 #if HAVE_DLFCN_H
 
-#include <sys/types.h>
 #include <dirent.h>
 #include <dlfcn.h>
 #include <stdio.h>
diff --git a/src/process.c b/src/process.c
index 180efa5..7f4f12c 100644
--- a/src/process.c
+++ b/src/process.c
@@ -23,7 +23,6 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
-#include <sys/types.h>
 #include <sys/stat.h>
 
 int osmo_daemonize(void)
diff --git a/src/statistics.c b/src/statistics.c
index a612140..83bb6ed 100644
--- a/src/statistics.c
+++ b/src/statistics.c
@@ -20,7 +20,6 @@
  *
  */
 
-#include <sys/types.h>
 #include <string.h>
 
 #include <osmocom/core/linuxlist.h>
diff --git a/src/talloc.c b/src/talloc.c
index 60d7927..d3a0690 100644
--- a/src/talloc.c
+++ b/src/talloc.c
@@ -48,7 +48,6 @@
 
 #ifndef _TALLOC_SAMBA3
 //#include "replace.h"
-#include <sys/types.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <stdbool.h>
diff --git a/tests/sms/sms_test.c b/tests/sms/sms_test.c
index f5d82b9..b4ed631 100644
--- a/tests/sms/sms_test.c
+++ b/tests/sms/sms_test.c
@@ -22,7 +22,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/types.h>
 #include <osmocom/core/msgb.h>
 #include <osmocom/gsm/gsm_utils.h>
 #include <osmocom/core/utils.h>