[build] Fix compilation deadlock issue

Why I did it
If the previous compilation exited abnormally during the installation
process, the subsequent compilation process(ex: make target/xxx.bin
SONIC_BUILD_JOBS=4) may enter a deadlock state because the file
lock(`$(DEBS_PATH)/dpkg_lock`) may not be deleted.

How I did it
Try to deleted the file lock before starting compilation.

How to verify it
The compilation always be OK though the previous compilation exited
abnormally during the installation process.

Signed-off-by: Long Wu <[email protected]>

Author: longwu-clounix

slave.mk

@@ -379,6 +379,9 @@ endif
 export RUST_CROSS_COMPILE_TARGET
 endif
 
+# try to remove the lock to avoid residual lock from previous abnormal exits.
+$(shell [ -d $(DEBS_PATH)/dpkg_lock ] && rm -d $(DEBS_PATH)/dpkg_lock)
+
 ###############################################################################
 ## Routing stack related exports
 ###############################################################################