[Ur] few security patches

[Sergey Mironov]

Hi. Let me post a few more patches dealing with security.

1_of_4_Check_realloc_s_return_code_to_prevent_segfault_on_out_of_memory_condition__Part_2_.patch

This patch re-fixes the realloc problem from the previous patch. I
forgot to restore the pointer to buffer in case of realloc error.

2_of_4_Replace_common__if__quiet__printf_______pattern_with_a_macro.patch

This one replaces common if(!quiet) printf(...) pattern with a safe macro

3_of_4_Check_realloc_s_return_code_to_prevent_segfault_on_out_of_memory_condition__Part_3_.patch

Here we have more realloc fixes, this time in http.c

4_of_4_Introduce_recv_timeout_controlled_by___T__option_in_http_c.patch

The most important one: I found that http.c-based applications suffer
from a kind of DDoS attacks where attacker opens connections to the
application, but sends no data. As soon as all threads block in their
[recv]s, application stops answering requests. This patch helps to
protect the application by setting up a timeout for recv and an option
to control it.

Please, review/apply!


Regards,
Sergey
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