Fix compilation on some configurations (#803)

Motivation:

We need ignore a warning when compiling on some platforms when building BoringSSL as otherwise the compilation fails.

Modifications:

Adds -Wno-error=stringop-overflow flag to BoringSSL compilation so that
it starts working again on specific OS/architecture configuration.

Result:

Fixes #800

boringssl-static/pom.xml

@@ -200,7 +200,7 @@
                               <!-- On *nix, add ASM flags to disable executable stack -->
                               <property name="cmakeAsmFlags" value="-Wa,--noexecstack" />
                               <!-- Use -DOPENSSL_C11_ATOMIC so we replace most of the locking code with atomics-->
-                              <property name="cmakeCFlags" value="-O3 -fno-omit-frame-pointer -DOPENSSL_C11_ATOMIC" />
+                              <property name="cmakeCFlags" value="-O3 -fno-omit-frame-pointer -DOPENSSL_C11_ATOMIC -Wno-error=stringop-overflow" />
                               <!-- We need to define __STDC_CONSTANT_MACROS and __STDC_FORMAT_MACROS when building boringssl on centos 6 -->
                               <property name="cmakeCxxFlags" value="-O3 -fno-omit-frame-pointer -Wno-error=maybe-uninitialized -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS" />
                             </then>