Avoid all calls to libdl (or equivalent) if NO_DYNAMIC_VP is defined

The same ifdefs are already used in the corresponding constructors,
so this just avoids a runtime/link time library dependency which
is practically unused in this build setup.
Merge pull request #45 from mstorsjo/no-libdl

Avoid all calls to libdl (or equivalent) if NO_DYNAMIC_VP is defined
Enable 64-bit build on Linux & Mac
Add Windows 64-bit build to VS project files
Fix function name typo in enc test app
Remove redundant NULL check

Address of a pointer variable can never be NULL.
Make the two ParseCommandLine functions consistent

with respect to strcmp function call.
Removed unnecessary brackets.
Merge pull request #50 from varunbpatil/cleanup

Fix function name type and remove redundant NULL check
Merge pull request #48 from licaiguo/master

Add 64-bit build support for windows & Linux
Add 64bit builds to Travis
Merge pull request #51 from ethanhugg/travis1

Add 64bit builds to Travis