build: fix various includes for older GCC

src/helpers.c

@@ -27,6 +27,7 @@
 # include <linux/perf_event.h>
 # include <sys/syscall.h>
 #endif
+#include <string.h>
 #include <unistd.h>
 
 #include "helpers.h"

src/libsysprof-ui/sysprof-mark-visualizer-row.c

@@ -22,6 +22,8 @@
 
 #include "config.h"
 
+#include <string.h>
+
 #include "sysprof-capture-condition.h"
 #include "sysprof-capture-cursor.h"
 #include "rectangles.h"

src/libsysprof/sysprof-hostinfo-source.c

@@ -24,6 +24,7 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <sys/stat.h>
 #include <unistd.h>
 

src/libsysprof/sysprof-memory-source.c

@@ -25,6 +25,7 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
+#include <string.h>
 #include <sysprof-capture.h>
 #include <unistd.h>
 

src/libsysprof/sysprof-perf-source.c

@@ -42,6 +42,7 @@
 #include <gio/gio.h>
 #include <glib/gi18n.h>
 #include <errno.h>
+#include <stdlib.h>
 #include <string.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
@@ -429,7 +430,7 @@ sysprof_perf_get_tracepoint_config (const char *path, gint64 *config)
 
   g_free(filename);
 
-  *config = strtoull(contents, NULL, 0);
+  *config = strtoull (contents, NULL, 0);
 
   g_free (contents);
 

src/sysprofd/meson.build

@@ -10,7 +10,6 @@ sysprofd_sources = [
 pkglibexecdir = join_paths(get_option('prefix'), get_option('libexecdir'))
 
 sysprofd_deps = [
-  dependency('libsystemd', version: '>=222'),
   dependency('glib-2.0', version: glib_req_version),
   dependency('gio-2.0', version: glib_req_version),
   dependency('gio-unix-2.0', version: glib_req_version),

src/sysprofd/sysprofd.c

@@ -23,6 +23,7 @@
 #include "config.h"
 
 #include <gio/gio.h>
+#include <stdlib.h>
 
 #include "ipc-service.h"
 #include "ipc-service-impl.h"

src/tests/test-capture.c

@@ -21,6 +21,7 @@
 #include "config.h"
 
 #include <glib/gstdio.h>
+#include <string.h>
 #include <sysprof-capture.h>
 
 static void