Update SConstruct
Update SConstruct

Add " -D_WIN32_WINNT=0x0501 " to link with getaddrinfo and
Add optimizations when build with MinGW on 32-bit Windows OS.

<<Since the getaddrinfo() is available to Windows XP onwards,
it is sufficient to use that windows version code as the value
of the constant mentioned above.>>

Compiling with scons --m32
HeliumProject/mongo-c,mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,Elastica/mongo-c-driver-legacy,HeliumProject/mongo-c,HeliumProject/mongo-c,mongodb/mongo-c-driver-legacy,mongodb/mongo-c-driver-legacy,HeliumProject/mongo-c