FS-6293: abandon xmlrpc-c build system entirely. We can revist this when we try to pull this lib out of tree, in the mean time, this fixes a ton of problems.

libs/xmlrpc-c/include/xmlrpc-c/config.h.in

@@ -0,0 +1,41 @@
+#ifndef XMLRPC_C_CONFIG_H_INCLUDED
+#define XMLRPC_C_CONFIG_H_INCLUDED
+
+/* This file, part of XML-RPC For C/C++, is meant to 
+   define characteristics of this particular installation 
+   that the other <xmlrpc-c/...> header files need in 
+   order to compile correctly when #included in Xmlrpc-c
+   user code.
+
+   Those header files #include this one.
+
+   This file was created by a make rule.
+*/
+#define XMLRPC_HAVE_WCHAR @HAVE_WCHAR_H_DEFINE@
+#ifdef WIN32
+  /* SOCKET is a type defined by <winsock.h>.  Anyone who
+     uses XMLRPC_SOCKET on a WIN32 system must #include
+     <winsock.h>
+  */
+  #define XMLRPC_SOCKET SOCKET
+  #define XMLRPC_HAVE_TIMEVAL 0
+  #define XMLRPC_HAVE_TIMESPEC 0
+  #define XMLRPC_HAVE_PTHREAD 0
+#else
+  #define XMLRPC_SOCKET int
+  #define XMLRPC_HAVE_TIMEVAL 1
+  #define XMLRPC_HAVE_TIMESPEC 1
+  #define XMLRPC_HAVE_PTHREAD 1
+#endif
+
+#if defined(_MSC_VER)
+  /* Newer MSVC has long long, but MSVC 6 does not */
+  #define XMLRPC_INT64 __int64
+  #define XMLRPC_PRId64 "I64"
+  #define XMLRPC_INT32 __int32
+#else
+  #define XMLRPC_INT64 long long
+  #define XMLRPC_PRId64 "lld"
+  #define XMLRPC_INT32 int
+#endif
+#endif