* Makefile.in (LIB2ADDEHDEP): Add unwind.h and unwind-pe.h.
        * mklibgcc.in (libgcc_dep): New, covering general dependencies, but
        not unwind code specific ones.
        (libgcc2_c_dep): Replace general dependencies with use of libgcc_dep.
        Remove unwind code specific dependencies.
        (libgcov_c_dep): Replace general dependencies with use of libgcc_dep.
        Remove gbl-ctors.h.
        Add libgcc_dep to output generated for LIB2ADD, LIB2ADDEH, and
        LIB2ADD_ST. Add LIB2ADDEHDEP to output generated for LIB2ADDEH.

From-SVN: r87026