If you can't load a shared library it should be a warning

This has bitten me more than once when working on Library_merged.

Change-Id: I829f5d010b6df2935fd191bdec9bac04bb003f16

sal/osl/unx/module.cxx

@@ -160,7 +160,7 @@ oslModule SAL_CALL osl_loadModuleAscii(const sal_Char *pModuleName, sal_Int32 nR
             ((nRtldMode & SAL_LOADMODULE_GLOBAL) ? RTLD_GLOBAL : RTLD_LOCAL);
         void* pLib = dlopen(pModuleName, rtld_mode);
 
-        SAL_INFO_IF(
+        SAL_WARN_IF(
             pLib == 0, "sal.osl",
             "dlopen(" << pModuleName << ", " << rtld_mode << "): "
                 << dlerror());