[bsp/stm32/rmc] update ci and README, delete c99 flag in rtconfig.py.

Author: icrazt

.github/workflows/action.yml

@@ -82,6 +82,7 @@ jobs:
          - {RTT_BSP: "stm32/stm32f401-st-nucleo", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "stm32/stm32f405-smdz-breadfruit", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "stm32/stm32f407-atk-explorer", RTT_TOOL_CHAIN: "sourcery-arm"}
+         - {RTT_BSP: "stm32/stm32f407-robomaster-c", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "stm32/stm32f407-st-discovery", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "stm32/stm32f410-st-nucleo", RTT_TOOL_CHAIN: "sourcery-arm"}
          - {RTT_BSP: "stm32/stm32f411-atk-nano", RTT_TOOL_CHAIN: "sourcery-arm"}

bsp/stm32/README.md

@@ -26,6 +26,7 @@ STM32 系列 BSP 目前支持情况如下表所示：
 | [stm32f401-st-nucleo](stm32f401-st-nucleo) | ST 官方 STM32F401 Nucleo-64 开发板 |
 | [stm32f405-smdz-breadfruit](stm32f405-smdz-breadfruit) | 三木电子 SM1432F405 开发板 |
 | [stm32f407-atk-explorer](stm32f407-atk-explorer) | 正点原子 F407 探索者开发板 |
+| [stm32f407-robomaster-c](stm32f407-robomaster-c) | 大疆公司 RoboMaster C型开发板 |
 | [stm32f407-st-discovery](stm32f407-st-discovery) | ST 官方 STM32F407-discovery 开发板 |
 | [stm32f410-st-nucleo](stm32f410-st-nucleo) | ST 官方 STM32F410-Nucleo-64 开发板 |
 | [stm32f411-atk-nano](stm32f411-atk-nano/) | 正点原子 F411 NANO 开发板 |

bsp/stm32/stm32f407-robomaster-c/rtconfig.py

@@ -89,7 +89,6 @@
         CFLAGS += ' -O2'
 
     CXXFLAGS = CFLAGS 
-    CFLAGS += ' -std=c99'
 
     POST_ACTION = 'fromelf --bin $TARGET --output rtthread.bin \nfromelf -z $TARGET'