Fix mac build

[JBaczuk]

non default locations for libcrypto and libboost make configure script fail.

[JBaczuk]

c++11 compilation errors as well:

util.cpp:88:6: error: non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned char' in initializer list [-Wc++11-narrowing]
            (value & 0x000000ff),
            ^~~~~~~~~~~~~~~~~~~~
util.cpp:88:6: note: insert an explicit cast to silence this issue
            (value & 0x000000ff),
            ^~~~~~~~~~~~~~~~~~~~
            static_cast<unsigned char>( )
util.cpp:89:6: error: non-constant-expression cannot be narrowed from type 'unsigned int' to 'unsigned char' in initializer list [-Wc++11-narrowing]
            (value & 0x0000ff00)  >> 8,
            ^~~~~~~~~~~~~~~~~~~~~~~~~~
...