chore, check for nand32() and isnand32()
chore, make sure we check for nand32() and isnand32() in -lm
minor, introduce dfp754_CFLAGS/dfp754_LIBS to aid systems where the autodetection fails
minor, try -lm and -ldecNumber
minor, use _SXE_TRY_DFP754_FLAGS to test for CFLAGS and LIBS simultaneously
Merge branch 'bld/ppc'

* bld/ppc:
  minor, use _SXE_TRY_DFP754_FLAGS to test for CFLAGS and LIBS simultaneously
  minor, try -lm and -ldecNumber
  minor, introduce dfp754_CFLAGS/dfp754_LIBS to aid systems where the autodetection fails
  chore, make sure we check for nand32() and isnand32() in -lm
  chore, check for nand32() and isnand32()