Add #pragma once to Headers Without an Include Guard

.github/workflows/build_orca.yml

@@ -179,13 +179,6 @@ jobs:
         if: runner.os == 'macOS' && !inputs.macos-combine-only && !vars.SELF_HOSTED
         run: |
           df -hI /
-          # Deleting the unused Xcodes takes minutes, so only do it when the
-          # build might not fit. A cold build uses under 4 GiB after this step.
-          avail_gib=$(df -g / | awk 'NR == 2 { print $4 }')
-          if [ "$avail_gib" -ge 15 ]; then
-            echo "$avail_gib GiB free, enough for the build"
-            exit 0
-          fi
           # Keep only the selected Xcode
           xcode=$(basename "$(cd "$(xcode-select -p)/../.." && pwd -P)")
           sudo find /Applications -maxdepth 1 -type d -name "Xcode_*.app" ! -name "$xcode" -exec rm -rf {} +

src/libslic3r/Format/ModelIO.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <string>
 
 namespace Slic3r {

src/libslic3r/QuadricEdgeCollapse.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 // paper: https://people.eecs.berkeley.edu/~jrs/meshpapers/GarlandHeckbert2.pdf
 // sum up: https://users.csc.calpoly.edu/~zwood/teaching/csc570/final06/jseeba/
 // inspiration: https://github.com/sp4cerat/Fast-Quadric-Mesh-Simplification

src/slic3r/GUI/InstanceCheckMac.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #import <Cocoa/Cocoa.h>
 
 @interface OtherInstanceMessageHandlerMac : NSObject

src/slic3r/GUI/PartSkipDialog.hpp

@@ -1,3 +1,5 @@
+#pragma once
+
 #include "slic3r/GUI/wxExtensions.hpp"
 #include <map>
 #include <cstdint>

src/slic3r/GUI/RemovableDriveManagerMM.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #import <Cocoa/Cocoa.h>
 
 @interface RemovableDriveManagerMM : NSObject

src/slic3r/GUI/Widgets/TextCtrl.h

@@ -1,3 +1,5 @@
+#pragma once
+
 #include <wx/textctrl.h>
 #include <wx/colour.h>