sal: partially revert a251fe4d

The change to sal/log.hxx affects extensions too which are not required
to use a C++11 compiler.

Change-Id: I3ed08f9a02a2e082fcdb821bce84244597f2390a
(cherry picked from commit f168fcae)
Reviewed-on: https://gerrit.libreoffice.org/17502Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>

include/sal/log.hxx

@@ -74,18 +74,27 @@ template< typename T > inline StreamIgnore operator <<(
     SAL_UNUSED_PARAMETER StreamStart const &, SAL_UNUSED_PARAMETER T const &)
 {
     std::abort();
+#if defined _MSC_VER && _MSC_VER < 1700
+    return StreamIgnore();
+#endif
 }
 
 template< typename T > inline StreamIgnore operator <<(
     SAL_UNUSED_PARAMETER StreamString const &, SAL_UNUSED_PARAMETER T const &)
 {
     std::abort();
+#if defined _MSC_VER && _MSC_VER < 1700
+    return StreamIgnore();
+#endif
 }
 
 template< typename T > inline StreamIgnore operator <<(
     SAL_UNUSED_PARAMETER StreamIgnore const &, SAL_UNUSED_PARAMETER T const &)
 {
     std::abort();
+#if defined _MSC_VER && _MSC_VER < 1700
+    return StreamIgnore();
+#endif
 }
 
 template< typename T > typename T::Result getResult(T const &);
@@ -94,6 +103,9 @@ inline char const * unwrapStream(StreamString const & s) { return s.string; }
 
 inline char const * unwrapStream(SAL_UNUSED_PARAMETER StreamIgnore const &) {
     std::abort();
+#if defined _MSC_VER && _MSC_VER < 1700
+    return 0;
+#endif
 }
 
 } }