To reproduce:
1. Open the attached project;
2. Change Graphics API to OpenGLES3;
3. Build and run Lights scene on Mali devices.

Expected result: Spot lights are rendered correctly.
Actual result: spot lights are not rendered on Mali devices with OpenGLES3.

Devices under testing:
Reproduced on:
-Samsung Galaxy Note 8 (SM-N950F), 7.1.1, CPU: Exynos 9 Octa 8895, GPU: Mali-G71;
-Samsung Galaxy S8 (SM-G950F), 8.0.0, CPU: Exynos 9 Octa 8895, GPU: Mali-G71;
-Samsung Galaxy S9 (SM-G960F), 8.0.0, CPU: Exynos 9 Series 9810, GPU: Mali-G72.

Not reproduced on:
-Google Pixel 2, 8.1.0, CPU: Qualcomm Snapdragon 835, GPU: Adreno 540;
-Huawei Nexus 6P (Nexus 6P), 8.0.0, CPU: Snapdragon 810 MSM8994, GPU: Adreno (TM) 430;
-Samsung Galaxy S9 (SM-G960U1), 8.0.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630.

Reproduced with: 2018.2.0a7, 2018.2.0a8, 2018.2.1f1, 2018.3.0a6, 2018.3.0a7.
Not reproduced with: 2018.1.6f1, 2018.2.0a1, 2018.2.0a3, 2018.2.0a6.