fix Android build (desktop)

stol is missing in the std namespace on the broken Android toolchain, work it around.

(I copycat https://cgit.freedesktop.org/libreoffice/core/commit/?id=c2673a358c78b864c1276f7956d5a348003b7a02)

Change-Id: I4d85b81abf5d72c08d9aae72638823b8a0484cc1
Reviewed-on: https://gerrit.libreoffice.org/29921Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>

desktop/source/lib/init.cxx

@@ -109,6 +109,12 @@ std::string to_string(T x)
     stream << x;
     return stream.str();
 }
+
+long stol( const std::string& str, std::size_t* /*pos*/ = 0, int base = 10 );
+{
+    char* end;
+    return strtol(str.c_str(), &end, base);
+}
 }
 #endif