Fix the build on clang-11

Clang tidy 11 got some really neat checks that do a much better job.
Unfortunately, this, combined with the change in how std::executors has
defined how callbacks should work differently in the past, which we
picked up in 1.73, and now in theory we have recursion in a bunch of our
IO loops that we have to break manually.  In practice, this is unlikely
to matter, as there's almost a 0% chance that we go through N thousand
requests without ever starving the IO buffer.

Other changes to make this build include:
1. Adding inline on the appropriate places where declared in a header.
2. Removing an Openssl call that did nothing, as the result was
immediately overwritten.
3. Declaring the subproject dependencies as system dependencies, which
silences the clang-tidy checks for those projects.

Tested:
Code builds again, clang-tidy passes

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ic11b1002408e8ac19a17a955e9477cac6e0d7504
diff --git a/http/utility.hpp b/http/utility.hpp
index be50636..19ffe9f 100644
--- a/http/utility.hpp
+++ b/http/utility.hpp
@@ -124,6 +124,7 @@
 
 inline bool isParameterTagCompatible(uint64_t a, uint64_t b)
 {
+
     if (a == 0)
     {
         return b == 0;
@@ -151,6 +152,7 @@
 
 constexpr uint64_t getParameterTag(std::string_view s, unsigned p = 0)
 {
+
     if (p == s.size())
     {
         return 0;