Removed gpu makefile from wrong branch.

lib/gpu/Makefile.linux

-# /* ----------------------------------------------------------------------   
-#  Generic Linux Makefile for CUDA 
-#     - Change CUDA_ARCH for your GPU
-# ------------------------------------------------------------------------- */
-
-# which file will be copied to Makefile.lammps
-
-EXTRAMAKE = Makefile.lammps.standard
-
-ifeq ($(CUDA_HOME),)
-CUDA_HOME = /opt/cuda
-endif
-
-NVCC = nvcc
-
-# older CUDA
-#CUDA_ARCH = -arch=sm_21
-# newer CUDA
-#CUDA_ARCH = -arch=sm_13
-# older CUDA
-#CUDA_ARCH = -arch=sm_10 -DCUDA_PRE_THREE
-CUDA_ARCH = -arch=sm_61
-
-# this setting should match LAMMPS Makefile
-# one of LAMMPS_SMALLBIG (default), LAMMPS_BIGBIG and LAMMPS_SMALLSMALL
-
-LMP_INC = -DLAMMPS_SMALLBIG
-
-# precision for GPU calculations
-# -D_SINGLE_SINGLE  # Single precision for all calculations
-# -D_DOUBLE_DOUBLE  # Double precision for all calculations
-# -D_SINGLE_DOUBLE  # Accumulation of forces, etc. in double
-
-CUDA_PRECISION = -D_SINGLE_DOUBLE
-
-CUDA_INCLUDE = -I$(CUDA_HOME)/include
-CUDA_LIB = -L$(CUDA_HOME)/lib64
-CUDA_OPTS = -DUNIX -O3 -Xptxas -v --use_fast_math $(LMP_INC) -Xcompiler -fPIC
-
-CUDR_CPP = mpicxx -DMPI_GERYON -DUCL_NO_EXIT -DMPICH_IGNORE_CXX_SEEK -DOMPI_SKIP_MPICXX=1 -fPIC
-CUDR_OPTS = -O2 $(LMP_INC) # -xHost -no-prec-div -ansi-alias
-
-BIN_DIR = ./
-OBJ_DIR = ./
-LIB_DIR = ./
-AR = ar
-BSH = /bin/sh
-
-CUDPP_OPT = -DUSE_CUDPP -Icudpp_mini
-
-include Nvidia.makefile
-