Use LibCURL_ jll and fix SSL cert problem

[aviks]

Incorporates #75, and fixes the SSL certificate problem by supplying the mozilla CA bundle with the jll.

[Edit] I've removed the @test_broken annotation for the ssl tests in windows and bsd. Tests should now pass on all platforms.

[aviks]

FreeBSD test failure seems unrelated. Works for windows and linux.

[codecov-io]

Codecov Report

Merging #78 into master will decrease coverage by 6.51%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #78      +/-   ##
=========================================
- Coverage   13.33%   6.81%   -6.52%     
=========================================
  Files           2       2              
  Lines          75     132      +57     
=========================================
- Hits           10       9       -1     
- Misses         65     123      +58     

Impacted Files	Coverage Δ
src/LibCURL.jl	36.36% <ø> (-5.31%)	:arrow_down:
src/lC_curl_h.jl	4.13% <0.00%> (-3.81%)	:arrow_down:

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[aviks]

@omus let me know if you have any concerns with this. I'll merge and tag this soon-ish otherwise.

[omus]

This looks great! I'll just check the failing FreeBSD test and go from there. I think what I'll do is I'll merge my open PR and then we can rebase these changes. That should make it more obvious what is going on when looking at the merged/closed PRs.

[aviks]

Incorporated into #75