Remove useless whitespace at end of lines

README

config/ac_func_accept_argtypes.m4

config/general.m4

configure.in

contrib/README

contrib/btree_gin/Makefile

contrib/btree_gin/expected/cidr.out

contrib/btree_gin/expected/date.out

contrib/btree_gin/expected/inet.out

contrib/btree_gin/expected/interval.out

contrib/btree_gin/expected/macaddr.out

contrib/btree_gin/expected/time.out

contrib/btree_gin/expected/timestamp.out

contrib/btree_gin/expected/timestamptz.out

contrib/btree_gin/expected/timetz.out

contrib/btree_gin/sql/cidr.sql

contrib/btree_gin/sql/date.sql

contrib/btree_gin/sql/inet.sql

contrib/btree_gin/sql/interval.sql

contrib/btree_gin/sql/macaddr.sql