Bugzilla Bugs 261649 and 321579: fixed BeOS build error caused by previous

checkin.  BeOS uses glibc but not the dlxxx functions declared in dlfcn.h.

nsprpub/pr/src/linking/prlink.c

@@ -1388,8 +1388,8 @@ PR_LoadStaticLibrary(const char *name, const PRStaticLinkTable *slt)
 PR_IMPLEMENT(char *)
 PR_GetLibraryFilePathname(const char *name, PRFuncPtr addr)
 {
-#if defined(SOLARIS) || defined(FREEBSD) \
-        || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__)
+#if defined(USE_DLFCN) && (defined(SOLARIS) || defined(FREEBSD) \
+        || defined(LINUX) || defined(__GNU__) || defined(__GLIBC__))
     Dl_info dli;
     char *result;