[BUILD] Update install.sh for RCCL build (#1191)

Signed-off-by: nileshnegi <Nilesh.Negi@amd.com>

toolchain-linux.cmake

@@ -0,0 +1,19 @@
+
+if (DEFINED ENV{ROCM_PATH})
+  set(rocm_bin "$ENV{ROCM_PATH}/bin")
+else()
+  set(ROCM_PATH "/opt/rocm" CACHE PATH "Path to the ROCm installation.")
+  set(rocm_bin "/opt/rocm/bin")
+endif()
+
+if (NOT DEFINED ENV{CXX})
+  set(CMAKE_CXX_COMPILER "${rocm_bin}/hipcc" CACHE PATH "Path to the C++ compiler")
+else()
+  set(CMAKE_CXX_COMPILER "$ENV{CXX}" CACHE PATH "Path to the C++ compiler")
+endif()
+
+if (NOT DEFINED ENV{CC})
+  set(CMAKE_C_COMPILER "${rocm_bin}/hipcc" CACHE PATH "Path to the C compiler")
+else()
+  set(CMAKE_C_COMPILER "$ENV{CC}" CACHE PATH "Path to the C compiler")
+endif()