unittest/googletest/Makefile: Unbreak out-of-tree build.
unittest/googletest/Makefile: Unbreak out-of-tree build.

  - Use SOURCES instead of Source. See Makefile.rules and MakefileGuide.html.
  - Don't assume the current directory. $(wildcard *.cc) doesn't match anything on corresponding build directory.

git-svn-id: a4a6f32337ebd29ad4763b423022f00f68d1c7b7@169568 91177308-0d34-0410-b5e6-96231b3b80d8

lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx,lodyagin/bare_cxx