Remove sc_adb_get_serialno()

The device serial is now retrieved from `adb devices -l`, `adb
get-serialno` is not called anymore.

PR #3005 <https://github.com/Genymobile/scrcpy/pull/3005>

app/src/adb/adb.c

@@ -587,38 +587,6 @@ sc_adb_getprop(struct sc_intr *intr, const char *serial, const char *prop,
     return strdup(buf);
 }
 
-char *
-sc_adb_get_serialno(struct sc_intr *intr, unsigned flags) {
-    const char *const argv[] = SC_ADB_COMMAND("get-serialno");
-
-    sc_pipe pout;
-    sc_pid pid = sc_adb_execute_p(argv, flags, &pout);
-    if (pid == SC_PROCESS_NONE) {
-        LOGE("Could not execute \"adb get-serialno\"");
-        return NULL;
-    }
-
-    char buf[128];
-    ssize_t r = sc_pipe_read_all_intr(intr, pid, pout, buf, sizeof(buf) - 1);
-    sc_pipe_close(pout);
-
-    bool ok = process_check_success_intr(intr, pid, "adb get-serialno", flags);
-    if (!ok) {
-        return NULL;
-    }
-
-    if (r == -1) {
-        return NULL;
-    }
-
-    assert((size_t) r < sizeof(buf));
-    buf[r] = '\0';
-    size_t len = strcspn(buf, " \r\n");
-    buf[len] = '\0';
-
-    return strdup(buf);
-}
-
 char *
 sc_adb_get_device_ip(struct sc_intr *intr, const char *serial, unsigned flags) {
     assert(serial);

app/src/adb/adb.h

@@ -86,14 +86,6 @@ char *
 sc_adb_getprop(struct sc_intr *intr, const char *serial, const char *prop,
                unsigned flags);
 
-/**
- * Execute `adb get-serialno`
- *
- * Return the result, to be freed by the caller, or NULL on error.
- */
-char *
-sc_adb_get_serialno(struct sc_intr *intr, unsigned flags);
-
 /**
  * Attempt to retrieve the device IP
  *