singular-4.3.1.p3-bp156.1.6

- Update to release 4.3.1p3
  No changelog provided
- Drop unused latex2html and cmake BuildRequires
- Drop unnecessary 0001-src-remove-__DATE__-__TIME__.patch,
  handllded by SOURCE_DATE_EPOCH
- Drop upstream
  0001-src-resolve-strict-aliasing-violation-in-ndbm.cc.patch

- Update to release 4.3.1
  * internal structural separation of coefficient rings and
    polynomial rings
- Drop 0001-build-resolve-automake-1.12-warnings.patch,
  0001-src-avoid-pointless-p-p-p-next.patch,
  0001-src-resolve-compiler-warnings-for-Wreturn-type.patch,
  0001-src-resolve-compiler-warnings-for-Wreturn-type-2.patch,
  0001-build-use-simpler-relative-path-specifications.patch
  0001-build-adequate-SO-versioning-for-shipped-libraries.patch,
  singular-so-version.diff (merged),
  0001-build-avoid-static-linkage-as-well-as-RPATH-entries-.patch
  (alternate version merged),
  singular-no-static.diff (alternate version merged),
  singular-fhs.diff (no replacement)
- Add 0001-src-resolve-strict-aliasing-violation-in-ndbm.cc.patch,
  0001-src-remove-__DATE__-__TIME__.patch

- fix debuginfo packaging failure for SLE 11