ALL: Remove obsolete register keyword

The register keyword was deprecated from the C++11 standard,
<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4193.html#809>,
and removed from the C++17 standard,
<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4340>, so
cannot exist in a well-formed C++17 program.

It has never done anything in GCC
<https://gcc.gnu.org/ml/gcc/2010-05/msg00113.html>
and because of the way it is specified in the standard, it is “as
meaningful as whitespace”
<http://www.drdobbs.com/keywords-that-arent-or-comments-by-anoth/184403859>.

The one remaining use of the register keyword is in the DS backend,
where it is used to create a local register variable using the
non-standard GCC Extended Asm feature.

Closes gh-1079.

4 files changed, 25 insertions, 25 deletions

diff --git a/backends/graphics/dinguxsdl/dinguxsdl-graphics.cpp b/backends/graphics/dinguxsdl/dinguxsdl-graphics.cpp
index 7d5f542ac0..e04c9145c2 100644
--- a/backends/graphics/dinguxsdl/dinguxsdl-graphics.cpp
+++ b/backends/graphics/dinguxsdl/dinguxsdl-graphics.cpp
@@ -313,13 +313,13 @@ void DINGUXSdlGraphicsManager::internUpdateScreen() {
 		dstPitch = _hwScreen->pitch;
 
 		for (r = _dirtyRectList; r != lastRect; ++r) {
-			register int dst_y = r->y + _currentShakePos;
-			register int dst_h = 0;
-			register int dst_w = r->w;
-			register int orig_dst_y = 0;
-			register int dst_x = r->x;
-			register int src_y;
-			register int src_x;
+			int dst_y = r->y + _currentShakePos;
+			int dst_h = 0;
+			int dst_w = r->w;
+			int orig_dst_y = 0;
+			int dst_x = r->x;
+			int src_y;
+			int src_x;
 
 			if (dst_y < height) {
 				dst_h = r->h;
diff --git a/backends/graphics/gph/gph-graphics.cpp b/backends/graphics/gph/gph-graphics.cpp
index 9a97e97aa5..910dab9140 100644
--- a/backends/graphics/gph/gph-graphics.cpp
+++ b/backends/graphics/gph/gph-graphics.cpp
@@ -337,13 +337,13 @@ void GPHGraphicsManager::internUpdateScreen() {
 		dstPitch = _hwScreen->pitch;
 
 		for (r = _dirtyRectList; r != lastRect; ++r) {
-			register int dst_y = r->y + _currentShakePos;
-			register int dst_h = 0;
-			register int dst_w = r->w;
-			register int orig_dst_y = 0;
-			register int dst_x = r->x;
-			register int src_y;
-			register int src_x;
+			int dst_y = r->y + _currentShakePos;
+			int dst_h = 0;
+			int dst_w = r->w;
+			int orig_dst_y = 0;
+			int dst_x = r->x;
+			int src_y;
+			int src_x;
 
 			if (dst_y < height) {
 				dst_h = r->h;
diff --git a/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp b/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
index b61ee690bb..57b7f8136b 100644
--- a/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
+++ b/backends/graphics/linuxmotosdl/linuxmotosdl-graphics.cpp
@@ -346,13 +346,13 @@ void LinuxmotoSdlGraphicsManager::internUpdateScreen() {
 		dstPitch = _hwscreen->pitch;
 
 		for (r = _dirtyRectList; r != lastRect; ++r) {
-			register int dst_y = r->y + _currentShakePos;
-			register int dst_h = 0;
-			register int dst_w = r->w;
-			register int orig_dst_y = 0;
-			register int dst_x = r->x;
-			register int src_y;
-			register int src_x;
+			int dst_y = r->y + _currentShakePos;
+			int dst_h = 0;
+			int dst_w = r->w;
+			int orig_dst_y = 0;
+			int dst_x = r->x;
+			int src_y;
+			int src_x;
 
 			if (dst_y < height) {
 				dst_h = r->h;
diff --git a/backends/graphics/surfacesdl/surfacesdl-graphics.cpp b/backends/graphics/surfacesdl/surfacesdl-graphics.cpp
index 3d4e811462..fd6e2bd400 100644
--- a/backends/graphics/surfacesdl/surfacesdl-graphics.cpp
+++ b/backends/graphics/surfacesdl/surfacesdl-graphics.cpp
@@ -1225,12 +1225,12 @@ void SurfaceSdlGraphicsManager::internUpdateScreen() {
 		dstPitch = _hwScreen->pitch;
 
 		for (r = _dirtyRectList; r != lastRect; ++r) {
-			register int dst_y = r->y + _currentShakePos;
-			register int dst_h = 0;
+			int dst_y = r->y + _currentShakePos;
+			int dst_h = 0;
 #ifdef USE_SCALERS
-			register int orig_dst_y = 0;
+			int orig_dst_y = 0;
 #endif
-			register int rx1 = r->x * scale1;
+			int rx1 = r->x * scale1;
 
 			if (dst_y < height) {
 				dst_h = r->h;