Enable C89 flag for unit tests (#718)

Signed-off-by: Gaurav Aggarwal <aggarg@amazon.com>

FreeRTOS/Test/CMock/testdir.mk

@@ -131,7 +131,7 @@ $(PROJ_DIR)/%.i : $(KERNEL_DIR)/%.c
 
 # compile the project objects with coverage instrumented
 $(PROJ_DIR)/%.o : $(PROJ_DIR)/%.i
-    $(CC) -c $< $(CPPFLAGS) $(CFLAGS) $(INCLUDE_DIR) $(GCC_COV_OPTS) -o $@
+    $(CC) -c $< $(CPPFLAGS) $(CFLAGS) $(INCLUDE_DIR) $(GCC_COV_OPTS) -Wall -Wextra -Werror -pedantic -std=c89 -o $@
 
 # Build mock objects
 $(SCRATCH_DIR)/mock_%.o : $(MOCKS_DIR)/mock_%.c

manifest.yml

@@ -4,7 +4,7 @@ description: "This is the standard distribution of FreeRTOS."
 
 dependencies:
   - name: "FreeRTOS-Kernel"
-    version: "78da9cb"
+    version: "e13f990"
     repository:
       type: "git"
       url: "https://github.com/FreeRTOS/FreeRTOS-Kernel.git"