update startup file

Author: Jan Kamidra

targets/TARGET_STM/TARGET_STM32U0/TARGET_STM32U083xC/TOOLCHAIN_GCC_ARM/startup_stm32u083xx.s

@@ -54,9 +54,11 @@ defined in linker script */
   .section .text.Reset_Handler
   .weak Reset_Handler
   .type Reset_Handler, %function
+
 Reset_Handler:
   ldr   r0, =_estack
   mov   sp, r0          /* set stack pointer */
+
 /* Call the clock system initialization function.*/
   bl  SystemInit
 
@@ -90,16 +92,12 @@ FillZerobss:
 LoopFillZerobss:
   cmp r2, r4
   bcc FillZerobss
-
-/* Call static constructors */
-  bl __libc_init_array
   
 /* Call the application's entry point.*/
-  bl _start
-
+ 	bl _start
+  
 LoopForever:
   b LoopForever
-
   .size Reset_Handler, .-Reset_Handler
 
 /**