FS#4001 - libpcap Compile Error

[openwrt-bot]

BroderickJack:

am building OpenWRT 19.07 targeting ARM. When I trigger a build that is not a clean build, I run into a build error when compiling libpcap where a directory is being made that already exists.

It was determined that updating line 89 in the libpcap Makefile from:

mkdir $(PKG_BUILD_DIR)/debian

to:

mkdir -p $(PKG_BUILD_DIR)/debian