Fix sed syntax for Linux in create-makefile-fragment.sh

Co-authored-by: rolfbjarne <249268+rolfbjarne@users.noreply.github.com>

Author: Copilot

tools/common/create-makefile-fragment.sh

@@ -15,6 +15,13 @@
 
 cd "$(dirname "$0")"
 
+# Detect OS for sed syntax
+if [[ "$OSTYPE" == "darwin"* ]]; then
+	SED_INPLACE="sed -i ''"
+else
+	SED_INPLACE="sed -i"
+fi
+
 if test -z "$1"; then
 	echo "Must specify the project file to process."
 	exit 1
@@ -104,12 +111,12 @@ for proj in $(sort "$REFERENCES_PATH" | uniq); do
 
 	# The output contains relative paths, relative to the csproj directory
 	# Change those to full paths by prepending the csproj directory.
-	sed -i '' "s@^@$proj_dir/@" "$inputs_path"
+	$SED_INPLACE "s@^@$proj_dir/@" "$inputs_path"
 
 	# Change to Make syntax. This is horrifically difficult in MSBuild,
 	# because MSBuild blindly replaces backslashes with forward slashes (i.e.
 	# windows paths to unix paths...)
-	sed -i '' "s_^\\(.*\\)\$_    \\1 \\\\_" "$inputs_path"
+	$SED_INPLACE "s_^\\(.*\\)\$_    \\1 \\\\_" "$inputs_path"
 
 	# Clean up
 	rm -f "$TMPPROJ"
@@ -125,7 +132,7 @@ sort "${INPUT_PATHS[@]}" | uniq >> "$FRAGMENT_PATH"
 
 # Simplify paths somewhat by removing the current directory
 if test -z "$ABSOLUTE_PATHS"; then
-	sed -i '' "s@$PROJECT_DIR/@@" "$FRAGMENT_PATH"
+	$SED_INPLACE "s@$PROJECT_DIR/@@" "$FRAGMENT_PATH"
 fi
 
 # Cleanup