[lldb][NFC] Use C++ versions of the deprecated C standard library headers

The C headers are deprecated so as requested in D102845, this is replacing them
all with their (not deprecated) C++ equivalent.

Reviewed By: shafik

Differential Revision: https://reviews.llvm.org/D103084

lldb/tools/debugserver/source/debugserver.cpp

@@ -8,8 +8,8 @@
 
 #include <arpa/inet.h>
 #include <asl.h>
+#include <cerrno>
 #include <crt_externs.h>
-#include <errno.h>
 #include <getopt.h>
 #include <netdb.h>
 #include <netinet/in.h>