Fix build when HAVE_POPEN is not set.

configure.ac

@@ -595,7 +595,7 @@ AH_TOP([
  * PIPEC is 1 if you wish to have the "|" command
  * which allows the user to pipe data into a shell command.
  */
-#define PIPEC (!SECURE)
+#define PIPEC (!SECURE && HAVE_POPEN)
 
 /*
  * LOGFILE is 1 if you wish to allow the -o option (to create log files).

filename.c

@@ -508,6 +508,7 @@ seek_filesize(f)
  return ((POSITION) spos);
 }
 
+#if HAVE_POPEN
 /*
  * Read a string from a file.
  * Return a pointer to the string in memory.
@@ -551,10 +552,6 @@ readfd(fd)
  return (buf);
 }
 
-
-
-#if HAVE_POPEN
-
 /*
  * Execute a shell command.
  * Return a pointer to a pipe connected to the shell command's standard output.
@@ -803,6 +800,7 @@ lrealpath(path)
  return (save(path));
 }
 
+#if HAVE_POPEN
 /*
  * Return number of %s escapes in a string.
  * Return a large number if there are any other % escapes besides %s.
@@ -828,6 +826,7 @@ num_pct_s(lessopen)
  }
  return (num);
 }
+#endif
 
 /*
  * See if we should open a "replacement file"