runtime(c): Add missing syntax test files

These were missing from commit c2a967a.

closes: #16470

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/c_preprocessor_embed.c

@@ -0,0 +1,31 @@
+// C preprocessor - binary resource inclusion
+
+// Source: https://en.cppreference.com/w/c/preprocessor/embed
+
+#include <stdint.h>
+#include <stdio.h>
+
+const uint8_t image_data[] = {
+#embed "image.png"
+};
+
+const char message[] = {
+#embed "message.txt" if_empty('M', 'i', 's', 's', 'i', 'n', 'g', '\n')
+,'\0' // null terminator
+};
+
+void dump(const uint8_t arr[], size_t size)
+{
+    for (size_t i = 0; i != size; ++i)
+        printf("%02X%c", arr[i], (i + 1) % 16 ? ' ' : '\n');
+    puts("");
+}
+
+int main()
+{
+    puts("image_data[]:");
+    dump(image_data, sizeof image_data);
+    puts("message[]:");
+    dump((const uint8_t*)message, sizeof message);
+}
+