gtest: Add recipe for v1.6.0
gtest: Add recipe for v1.6.0

:Release Notes:
Google gtest is needed for building and running unit tests.

:Detailed Notes:

:Testing Performed:
Checked the sysroot is populated with needed files.

:QA Notes:

:Issues Addressed:
[GF-3384] Create an OE component for GTest
[GF-11845] CCC: gtest=1.6.0

Open-webOS-DCO-1.0-Signed-off-by: Heegoo Han <heegoo.han@lge.com>
Open-webOS-DCO-1.0-Signed-off-by: Anatolii Sakhnik <a7c143e8cba6db2e87aecbeb98b81550c754e579@lge.com>

Change-Id: I12f5bab3895b588e7640a28b41827c7521d98187
Reviewed-on: https://g2g.palm.com/2550
Reviewed-by: Anatolii Sakhnik <a7c143e8cba6db2e87aecbeb98b81550c754e579@lge.com>
Tested-by: Anatolii Sakhnik <a7c143e8cba6db2e87aecbeb98b81550c754e579@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <62fb45708ac3f392369421d5b0d5e49e3fca4211@lge.com>
Reviewed-by: Susan Montooth <be0b8b1fe2cc6a744be9b1ae6516e077aa323e09@lge.com>

openwebos/meta-webos,Garfonso/meta-webos-ports,nizovn/meta-webos-ports,openwebos/meta-webos,openwebos/meta-webos,openwebos/meta-webos,nizovn/meta-webos-ports,Garfonso/meta-webos-ports