fix(unzip): fix autoconf dir API probe to prevent false NO_DIR on modern compilers

steps-guix/unzip-6.0/patches/fix-dir-detection-on-modern-c.patch

@@ -0,0 +1,15 @@
+--- unzip60/unix/configure	2009-01-17 22:57:24
++++ unzip60/unix/configure	2026-02-27 21:12:00
+@@ -418,7 +418,11 @@
+ 
+ echo Check for directory libraries
+ cat > conftest.c << _EOF_
+-int main() { return closedir(opendir(".")); }
++#include <sys/types.h>
++#include <dirent.h>
++int main() {
++  return closedir(opendir("."));
++}
+ _EOF_
+ 
+ $CC -o conftest conftest.c >/dev/null 2>/dev/null