fixes for Debian 9

- search for libdwarf.h in new locations (e.g., /usr/include/libdwarf/)
- build Bochs with -std=gnu++98 (gnu++14 is default since GCC 6.1)
- specify "proto2" syntax for protobuf messages
- minor build-system and C++ namespace fixes

Change-Id: I16dbc622c797ef8e936fe3c0fb9b03029d27529d

src/experiments/checksum-oostubs/checksum-oostubs.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message OOStuBSProtoMsg {
 	// Input: experiment parameters
 	// (client executes 8 experiments, one for each bit at mem_addr)

src/experiments/cool-checksum/coolchecksum.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message CoolChecksumProtoMsg {
 	// parameters
 	required uint32 instr_offset = 1;

src/experiments/cored-voter/cored_voter.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message CoredVoterProtoMsg {

src/experiments/dciao-kernelstructs/dciao_kernel.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message DCIAOKernelProtoMsg {

src/experiments/dosek/cored-tester.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message CoredTesterProtoMsg {

src/experiments/ecos_kernel_test/ecos_kernel_test.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message EcosKernelTestProtoMsg {

src/experiments/erika-tester/erika-tester.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message ErikaTesterProtoMsg {

src/experiments/fiascoFail/fiascofail.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message FiascofailProtoMsg {

src/experiments/generic-experiment/generic-experiment.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message GenericExperimentMessage {

src/experiments/kesogc/kesogc.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message KesoGcProtoMsg {

src/experiments/kesorefs/kesoref.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message KesoRefProtoMsg {

src/experiments/l4-sys/l4sys.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message L4SysProtoMsg {

src/experiments/lra-simple-panda/lra_simple.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message LraSimpleProtoMsg {

src/experiments/mh-test-campaign/MHTest.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message MHTestData {
 	optional string foo = 1;
 	optional int32 input = 2;

src/experiments/nanojpeg/nanojpeg.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message NanoJPEGProtoMsg {
 	// Input: experiment parameters
 	// (client executes one experiment for every specified bit in the target register)

src/experiments/rampage/rampage.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 message RAMpageProtoMsg {
 	// Input: experiment parameters
 

src/experiments/vezs-example/vezs.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message VEZSProtoMsg {

src/experiments/weather-monitor/weathermonitor.proto

@@ -1,3 +1,5 @@
+syntax = "proto2";
+
 import "DatabaseCampaignMessage.proto";
 
 message WeathermonitorProtoMsg {