IM880B startup files have wrong line-endings. Breaks checkout in Mac or Linux.

[SeppoTakalo]

Description

Following files have Windows line endings and therefore break checkout & rebase when done in Linux or Mac environment:

targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_ARM_MICRO/startup_stm32l151xba.S
targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_ARM_STD/startup_stm32l151xba.S
targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_GCC_ARM/startup_stm32l151xba.S
targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_IAR/startup_stm32l151xba.S

How to reproduce:

~/src/mbed-os$ git reset --hard origin/master
~/src/mbed-os$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_ARM_MICRO/startup_stm32l151xba.S
	modified:   targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_ARM_STD/startup_stm32l151xba.S
	modified:   targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_GCC_ARM/startup_stm32l151xba.S
	modified:   targets/TARGET_STM/TARGET_STM32L1/TARGET_IM880B/device/TOOLCHAIN_IAR/startup_stm32l151xba.S

Issue request type

[ ] Question
[ ] Enhancement
[X] Bug

[jeromecoutant]

I confirm the issue :-(

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-1460

[linlingao]

@SeppoTakalo Thanks for the fix. I've been agonizing over this!