Fix regression error messages for platforms Peter doesn't use.

src/test/regress/expected/abstime-solaris-1947.out

src/test/regress/expected/float4-exp-three-digits.out

src/test/regress/expected/float8-exp-three-digits.out

src/test/regress/expected/float8-fp-exception.out

src/test/regress/expected/float8-small-is-zero.out

src/test/regress/expected/horology-no-DST-before-1970.out

src/test/regress/expected/horology-solaris-1947.out

src/test/regress/expected/select_implicit.out

src/test/regress/expected/select_implicit_1.out

src/test/regress/expected/select_implicit_2.out

src/test/regress/expected/tinterval-solaris-1947.out