static: use pkg-config exclusively when using it

When using the static linking option on platforms that use pkg-config,
use ONLY pkg-config to get the CFLAGS and LDFLAGS. This prevents pulling
in dependencies and flags for any non-vendored version that may be
present on the host.

The main practical effect of this is that if someone doesn't need/want
any sort of remote access support at all they can completely disable
libcurl, libssh2, libssl, etc and produce a smaller/simpler binary and
greatly simplify their build-time dependencies. When done properly, the
generated pkg-config file will tell cgo everything it needs to know.

This also prevents confusion if there is a system copy of libgit2 that
is being given priority over the vendored build.

Signed-off-by: Ryan Graham <[email protected]>

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