Fixes
Creating library dll\win32\winhttp\winhttp.lib and object dll\win32\winhttp\winhttp.exp
LINK : warning LNK4199: /DELAYLOAD:ole32.dll ignored; no imports found from ole32.dll
which I could observe all the way from releases/0.4.7 up to releases/0.4.14
with MSVC 2010SP1 (16.0.40219.1) x86 target in dbg configuration
There is no need to compile our DLLs as shared libraries since we are
managing symbols exports and imports through spec files.
On my system, this reduces the configure-time by a factor of two.
