systemd: drop workaround for missing C11 header <uchar.h>

Now as we build as C11, we can us it.

Makefile.am

@@ -1550,7 +1550,6 @@ src_libsystemd_nm_la_SOURCES = \
 	src/systemd/sd-adapt/missing_socket.h \
 	src/systemd/sd-adapt/missing_syscall.h \
 	src/systemd/sd-adapt/missing_timerfd.h \
-	src/systemd/sd-adapt/missing_type.h \
 	src/systemd/sd-adapt/mkdir.h \
 	src/systemd/sd-adapt/procfs-util.h \
 	src/systemd/sd-adapt/raw-clone.h \
@@ -1599,6 +1598,7 @@ src_libsystemd_nm_la_SOURCES = \
 	src/systemd/src/basic/macro.h \
 	src/systemd/src/basic/mempool.c \
 	src/systemd/src/basic/mempool.h \
+	src/systemd/src/basic/missing_type.h \
 	src/systemd/src/basic/parse-util.c \
 	src/systemd/src/basic/parse-util.h \
 	src/systemd/src/basic/path-util.c \

src/systemd/sd-adapt/missing_type.h

@@ -1,3 +0,0 @@
-#pragma once
-
-/* dummy header */

src/systemd/sd-adapt/nm-sd-adapt.h

@@ -44,6 +44,10 @@
 #define HAVE_SYS_AUXV_H 0
 #endif
 
+/* we build with C11 and thus <uchar.h> provides char32_t,char16_t. */
+#define HAVE_CHAR32_T 1
+#define HAVE_CHAR16_T 1
+
 /*****************************************************************************/
 
 static inline NMLogLevel
@@ -151,12 +155,6 @@ raw_getpid (void) {
 
 /*****************************************************************************/
 
-/* work around missing uchar.h */
-typedef guint16 char16_t;
-typedef guint32 char32_t;
-
-/*****************************************************************************/
-
 static inline int
 sd_notify (int unset_environment, const char *state)
 {

src/systemd/src/basic/escape.h

@@ -5,9 +5,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <sys/types.h>
-#if 0 /* NM_IGNORED */
 #include <uchar.h>
-#endif /* NM_IGNORED */
 
 #include "string-util.h"
 #include "missing_type.h"

src/systemd/src/basic/missing_type.h

@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include <uchar.h>
+
+#if !HAVE_CHAR32_T
+#define char32_t uint32_t
+#endif
+
+#if !HAVE_CHAR16_T
+#define char16_t uint16_t
+#endif

src/systemd/src/basic/utf8.h

@@ -4,9 +4,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
-#if 0 /* NM_IGNORED */
 #include <uchar.h>
-#endif /* NM_IGNORED */
 
 #include "macro.h"
 #include "missing_type.h"