Fix "libbeauty" not a literal, fix 'common_LDFLAGS'

Fix errors from use of "libbeauty" vs [libbeauty] in configure.ac AC_INIT macro.
Fix errors from use of old 'INCLUDES' vs 'AM_CPPFLAGS' in configure.ac
Fix errors from use of 'common_LDFLAGS', confusing poor automake, reversed to 'LDFLAGS_common' so it doesn't make automake think it needs to find a source called 'common'.