feat: implement extern libs data writing

src/compiler/writer/wr_extern_libs.c

@@ -0,0 +1,30 @@
+#include <common/fzl_extern.h>
+#include <compiler/internals/writer.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+// Writer external lib names
+bool wr_extern_libs(FILE *fd, fzl_extern_lib_t *libs, size_t libs_count)
+{
+  if (!fd || !libs)
+    return false;
+
+  for (size_t i = 0; i < libs_count; i++)
+  {
+    fzl_extern_lib_t *lib = &libs[i];
+
+    if (!lib || !lib->name)
+      return false;
+
+    size_t len = strlen(lib->name);
+    if (len < 1)
+      return false;
+
+    fwrite(&len, sizeof(size_t), 1, fd);
+    fwrite(lib->name, sizeof(char), len, fd);
+  }
+
+  return true;
+}