🩹 Use #pragma once in pins files

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Creality 4.2.x (STM32F103RET6) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V4210.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * CREALITY 4.2.10 (STM32F103) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V427.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * CREALITY v4.2.7 (STM32F103) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V431.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * CREALITY v4.3.1 (STM32F103) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V452.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Creality v4.5.2 (STM32F103RET6) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V453.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Creality v4.5.3 (STM32F103RET6) board pin assignments

Marlin/src/pins/stm32f1/pins_CREALITY_V45x.h

@@ -19,6 +19,7 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  *
  */
+#pragma once
 
 /**
  * Creality v4.5.2 and v4.5.3 (STM32F103RET6) board pin assignments