Commit 46ebd9ef ("fix compilation with latest clang/llvm 7.0")
tried to fix a compilation introduced with latest clang change.
It did not fix the lua compilation issue since unfortunately
my bcc environment did not have lua setup properly for that commit.

This commit intends to fix for lua compilation issue as well.
The intermediate static library bcc-lua-static is removed and
now bcc-lua-static is just a list of static libraries used
for final linking to produce bcc-lua. This way, we do not
need the special linker flags like -Wl,--whole-archive and
-Wl,--no-whole-archive. The bcc-static and bcc-shared libraries
did not change since they will be installed and may be used
by the application.

Tested on FC27 based system, with the workaround in issue #1685,
all tests passed.

Fixes: 46ebd9ef ("fix compilation with latest clang/llvm 7.0")
Signed-off-by: Yonghong Song <yhs@fb.com>