[riscv/rv64] add vector test script

bsp/qemu-virt64-riscv/applications/test/test_vector/SConscript

@@ -0,0 +1,9 @@
+from building import *
+
+cwd     = GetCurrentDir()
+src	= Glob('*.c') + Glob('*.cpp')
+CPPPATH = [cwd]
+
+group = DefineGroup('Vector', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')