treewide: auto-convert the simple cases to log_*_errno()

As a followup to 086891e5c1 "log: add an "error" parameter to all
low-level logging calls and intrdouce log_error_errno() as log calls
that take error numbers", use sed to convert the simple cases to use
the new macros:

find . -name '*.[ch]' | xargs sed -r -i -e \
's/log_(debug|info|notice|warning|error|emergency)\("(.*)%s"(.*), strerror\(-([a-zA-Z_]+)\)\);/log_\1_errno(-\4, "\2%m"\3);/'

Multi-line log_*() invocations are not covered.
And we also should add log_unit_*_errno().

src/core/timer.c

@@ -148,7 +148,7 @@ static int timer_setup_persistent(Timer *t) {
 
                         r = get_home_dir(&h);
                         if (r < 0) {
-                                log_error("Failed to determine home directory: %s", strerror(-r));
+                                log_error_errno(-r, "Failed to determine home directory: %m");
                                 return r;
                         }