Windows compile and linker fixes.

* Do not include aithreadid.h from debug.h, because the latter is
  included everywhere (from linden_common.h) and aithreadid.h is
  heavy (includes among others windows.h).
* On windows, thread local members cannot be exported.

indra/cwdebug/debug.cc

@@ -416,12 +416,23 @@ void cwdebug_backtrace(int n)
 #elif defined(DEBUG_CURLIO)
 
 #include "debug.h"
+#include "aithreadid.h"
 
 namespace debug
 {
 
 libcwd_do_type const libcw_do;
-CWD_TLS int Indent::S_indentation;
+ll_thread_local int Indent::S_indentation;
+
+Indent::Indent(int indent) : M_indent(indent)
+{
+	S_indentation += M_indent;
+}
+
+Indent::~Indent()
+{
+	S_indentation -= M_indent;
+}
 
 std::ostream& operator<<(std::ostream& os, Indent::print_nt)
 {
@@ -430,6 +441,19 @@ std::ostream& operator<<(std::ostream& os, Indent::print_nt)
   return os;
 }
 
+std::ostream& operator<<(std::ostream& os, print_thread_id_t)
+{
+	if (!AIThreadID::in_main_thread_inline())
+	{
+#ifdef LL_DARWIN
+		os << std::hex << (size_t)apr_os_thread_current() << std::dec << ' ';
+#else
+		os << std::hex << (size_t)AIThreadID::getCurrentThread_inline() << std::dec << ' ';
+#endif
+	}
+	return os;
+}
+
 std::ostream& operator<<(std::ostream& os, libcwd::buf2str const& b2s)
 {
   static char const c2s_tab[7] = { 'a', 'b', 't', 'n', 'v', 'f', 'r' };