Removed unused files

build/gamesource/materials/water/water_studen.mtl

build/gamesource/textures/crete/crete_schiffer2.dds

build/gamesource/textures/door/door_gr_iov_01.dds

build/gamesource/textures/mtl/mtl_arm_2.dds

build/gamesource/textures/mtl/mtl_bo4ka_big_iov.dds

build/gamesource/textures/mtl/mtl_bochka_01.dds

build/gamesource/textures/mtl/mtl_bochka_02.dds

build/gamesource/textures/mtl/mtl_fence2.dds

build/gamesource/textures/mtl/mtl_fence2n.dds

build/gamesource/textures/mtl/mtl_gate_j01a.dds

build/gamesource/textures/mtl/mtl_pod_01.dds

build/gamesource/textures/mtl/mtl_rja_iov_01.dds

build/gamesource/textures/mtl/mtl_roof_red_iov.dds

build/gamesource/textures/mtl/mtl_rust_dark_iov.dds

build/gamesource/textures/mtl/mtl_rza_ch_01.dds

build/gamesource/textures/mtl/mtl_set_iov.dds

build/gamesource/textures/mtl/mtl_stena_ch_04.dds

build/gamesource/textures/mtl/mtl_truba_pod_01.dds

build/gamesource/textures/mtl/mtl_tubes3.dds

build/gamesource/textures/mtl/mtl_tubes3c.dds