tcg: Search includes from the project root source directory

tcg: Search includes from the project root source directory

We currently search both the root and the tcg/ directories for tcg
files:

  $ git grep '#include "tcg/' | wc -l
  28

  $ git grep '#include "tcg[^/]' | wc -l
  94

To simplify the preprocessor search path, unify by expliciting the
tcg/ directory.

Patch created mechanically by running:

  $ for x in \
      tcg.h tcg-mo.h tcg-op.h tcg-opc.h \
      tcg-op-gvec.h tcg-gvec-desc.h; do \
    sed -i "s,#include \"$x\",#include \"tcg/$x\"," \
      $(git grep -l "#include \"$x\""); \
    done

Acked-by: David Gibson <[email protected]> (ppc parts)
Reviewed-by: Paolo Bonzini <[email protected]>
Reviewed-by: Alistair Francis <[email protected]>
Reviewed-by: Stefan Weil <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Message-Id: <20200101112303[email protected]>
Signed-off-by: Richard Henderson <[email protected]>