Symlink instead of copy non-HTML files

This change is done so in a test environment, files like .less
stylesheets are always up to date in the target directory.

build/buildrun.sh

@@ -42,7 +42,7 @@ build_into(){
   } | t_logstatus phase_2 || exit 1
 
   if [ "$stagedir" != "$target" ]; then
-    rsync -av --del "$stagedir/" "$target/" | t_logstatus stagesync
+    rsync -av --copy-unsafe-links --del "$stagedir/" "$target/" | t_logstatus stagesync
   fi
 
   date +%s > "$(logname end_time)"

build/makerules.sh

@@ -210,8 +210,8 @@ COPY_DST_FILES := \$(sort \$(patsubst \$(INPUTDIR)/%,\$(OUTPUTDIR)/%,\$(COPY_SRC
 
 all: \$(COPY_DST_FILES)
 \$(COPY_DST_FILES): \$(OUTPUTDIR)/%: \$(INPUTDIR)/%
-	echo "* Copying file \$*"
-	cp "\$<" "\$@"
+	echo "* Linking file \$*"
+	ln -sf "\$<" "\$@"
 
 # -----------------------------------------------------------------------------
 # Copy .xhtml files to "source" directory in target directory tree
@@ -221,8 +221,8 @@ SOURCE_DST_FILES := \$(sort \$(patsubst \$(INPUTDIR)/%,\$(OUTPUTDIR)/source/%,\$
 
 all: \$(SOURCE_DST_FILES)
 \$(SOURCE_DST_FILES): \$(OUTPUTDIR)/source/%: \$(INPUTDIR)/%
-	echo "* Copying source \$*"
-	cp "\$<" "\$@"
+	echo "* Linking source \$*"
+	ln -sf "\$<" "\$@"
 
 # -----------------------------------------------------------------------------
 # Clean up excess files in target directory