daemon: Fix redundant redeclaration warning

CC     pulseaudio-dumpmodules.o
daemon/dumpmodules.c:93:27: warning: redundant redeclaration of ‘lt__PROGRAM__LTX_preloaded_symbols’ [-Wredundant-decls]
/usr/include/ltdl.h:106:36: note: previous declaration of ‘lt__PROGRAM__LTX_preloaded_symbols’ was here

the declaration is provided by ltld.h of libtool since version 2.4, require the 2.4 instead of 2.2

Signed-off-by: Peter Meerwald <p.meerwald@bct-electronic.com>

configure.ac

@@ -320,14 +320,9 @@ esac
 
 #### libtool stuff ####
 
-LT_PREREQ(2.2)
+LT_PREREQ(2.4)
 LT_INIT([dlopen win32-dll disable-static])
 
-dnl Unfortunately, even up to libtool 2.2.6a there is no way to know
-dnl exactly which version of libltdl is present in the system, so we
-dnl just assume that it's a working version as long as we have the
-dnl library and the header files.
-dnl
 dnl As an extra safety device, check for lt_dladvise_init() which is
 dnl only implemented in libtool 2.x, and refine as we go if we have
 dnl refined requirements.
@@ -345,7 +340,7 @@ AC_CHECK_HEADER([ltdl.h],
     [LIBLTDL=])
 
 AS_IF([test "x$LIBLTDL" = "x"],
-    [AC_MSG_ERROR([Unable to find libltdl version 2. Makes sure you have libtool 2.2 or later installed.])])
+    [AC_MSG_ERROR([Unable to find libltdl version 2. Makes sure you have libtool 2.4 or later installed.])])
 AC_SUBST([LIBLTDL])
 
 

src/daemon/dumpmodules.c

@@ -89,10 +89,6 @@ static void show_info(const char *name, const char *path, void (*info)(const cha
     }
 }
 
-#ifndef OS_IS_WIN32
-extern const lt_dlsymlist lt_preloaded_symbols[];
-#endif
-
 static int is_preloaded(const char *name) {
     const lt_dlsymlist *l;