STM32L1xx : GCC_ARM a call to _start which performs

    zero bss, C++ init and the call to main.
    Remove direct call to __libc_init_array and main not needed
    as _start is beeing called.

Author: jamike

targets/TARGET_STM/TARGET_STM32L1/TARGET_MOTE_L152RC/device/TOOLCHAIN_GCC_ARM/startup_stm32l152xc.S

@@ -109,11 +109,16 @@ LoopFillZerobss:
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit
-/* Call static constructors */
-    bl __libc_init_array
-/* Call the application's entry point.*/
-  bl main
+
+/**
+ * Calling the crt0 'cold-start' entry point. There __libc_init_array is called
+ * and when existing hardware_init_hook() and software_init_hook() before 
+ * starting main(). software_init_hook() is available and has to be called due 
+ * to initializsation when using rtos.
+*/
+  bl _start
   bx lr
+
 .size Reset_Handler, .-Reset_Handler
 
 /**

targets/TARGET_STM/TARGET_STM32L1/TARGET_NZ32_SC151/device/TOOLCHAIN_GCC_ARM/startup_stm32l151xc.S

@@ -109,11 +109,15 @@ LoopFillZerobss:
 
 /* Call the clock system intitialization function.*/
     bl  SystemInit
-/* Call static constructors */
-    bl __libc_init_array
-/* Call the application's entry point.*/
-  bl main
-  bx lr
+
+/**
+ * Calling the crt0 'cold-start' entry point. There __libc_init_array is called
+ * and when existing hardware_init_hook() and software_init_hook() before 
+ * starting main(). software_init_hook() is available and has to be called due 
+ * to initializsation when using rtos.
+*/
+    bl _start
+    bx lr
 .size Reset_Handler, .-Reset_Handler
 
 /**