Convert build system to cmake

Also, produce fully static binaries. This means that `gethostname`
does not work (doesn't work with static glibc unless you build it
with `--enable-static-nss`, which no distro builds glibc with).

cpp/core/Env.cpp

@@ -0,0 +1,19 @@
+#include "Env.hpp"
+#include "Assert.hpp"
+
+std::ostream& operator<<(std::ostream& out, LogLevel ll) {
+    switch (ll) {
+    case LogLevel::LOG_DEBUG:
+        out << "DEBUG";
+        break;
+    case LogLevel::LOG_INFO:
+        out << "INFO";
+        break;
+    case LogLevel::LOG_ERROR:
+        out << "ERROR";
+        break;
+    default:
+        throw EGGS_EXCEPTION("bad log level %s", (uint32_t)ll);
+    }
+    return out;
+}