[Ada] Remove obsolete s-sopco* and s-strops units

[Pierre-Marie de Rodat via Gcc-patches]

These units are not required anymore as oldest compiler version allowed
for bootstrap does not need them.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * libgnat/s-sopco3.ads, libgnat/s-sopco3.adb: Remove.
        * libgnat/s-sopco4.ads, libgnat/s-sopco4.adb: Remove.
        * libgnat/s-sopco5.ads, libgnat/s-sopco5.adb: Remove.
        * libgnat/s-strops.ads, libgnat/s-strops.adb: Remove.
        * Makefile.rtl (ADA_EXCLUDE_SRCS): Remove occurences of removed
        units.
        * gcc-interface/Make-lang.in (ada/sdefault.o): Remove
        dependencies on removed units.
        (GNATBIND_OBJS): Remove occurences of removed units.

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