util/path: handle missing d_type definitions on Solaris

Guard DT_REG usage so directory walking code still builds on platforms where dirent does not expose d_type or DT_REG, such as Solaris.

src/source-pcap-file-directory-helper.c

@@ -304,7 +304,7 @@ TmEcode PcapDirectoryPopulateBuffer(PcapFileDirectoryVars *pv,
     PendingFile *file_to_add = NULL;
 
     while ((dir = readdir(pv->directory)) != NULL) {
-#ifndef OS_WIN32
+#if defined(DT_REG)
         if (dir->d_type != DT_REG) {
             continue;
         }

src/util-path.c

@@ -196,7 +196,7 @@ bool SCPathExists(const char *path)
  */
 bool SCIsRegularDirectory(const struct dirent *const dir_entry)
 {
-#ifndef OS_WIN32
+#if !defined(OS_WIN32) && !defined(__sun)
     if ((dir_entry->d_type == DT_DIR) &&
         (strcmp(dir_entry->d_name, ".") != 0) &&
         (strcmp(dir_entry->d_name, "..") != 0)) {
@@ -214,7 +214,7 @@ bool SCIsRegularDirectory(const struct dirent *const dir_entry)
  */
 bool SCIsRegularFile(const struct dirent *const dir_entry)
 {
-#ifndef OS_WIN32
+#if defined(DT_REG)
     return dir_entry->d_type == DT_REG;
 #endif
     return false;