Fixed STM32F7 linker script error with new gcc

Author: danielinux

test-app/ARM-stm32f7.ld

@@ -17,6 +17,11 @@ SECTIONS
         . = ALIGN(4);
         _end_text = .;
     } > FLASH
+    .edidx :
+    {
+        . = ALIGN(4);
+        *(.ARM.exidx*)
+    } > FLASH
 
     _stored_data = .;