EmulatorPkg: Add missing DisplayEngineDxe driver

The BDS depends on the DisplayEngineDxe driver, but this driver was
not added to the EmulatorPkg.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Andrew Fish <afish@apple.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15469 6f19259b-4bc3-4df7-8a09-765794883524
EmulatorPkg/Unix GCC: Link to libdl

libdl is used for the dlopen and dlclose calls. We were already
linking to it, but it appears it may have been pulled in automatically
by the linker before.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15470 6f19259b-4bc3-4df7-8a09-765794883524
EmulatorPkg/Unix GCC: Add additional library search paths

IA32: add /usr/lib/i386-linux-gnu
X64: add /usr/lib/x86_64-linux-gnu

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15471 6f19259b-4bc3-4df7-8a09-765794883524