configure/Makefile: make Cygwin force less

configure/Makefile: make Cygwin force less

Continue the work started in commit
ca205a752c3d6ebe7de74a3dfe81808e48a502e3 ("configure: Make Cygwin take
regular configure path") by removing the forceful setting of flags that
are automatically detected anyway.

Even CONFIG_64BIT_LLP64 is unneeded because despite their names
CONFIG_32BIT/CONFIG_64BIT are only used to control the size's of words
and the regular configure path correctly detects CONFIG_32BIT for 64 bit
Windows even though it's LLP64.

Signed-off-by: Sitsofe Wheeler <sitsofe@yahoo.com>