Remove superfluous entry from EXTRA_DIST

curses.m4 is already included by automake as it's an m4 depdendency.
propagate flags for automake initialization
Refer to correct name of README.md

fcb67831f2759fb renamed README -> README.md but didn't update
EXTRA_DIST, breaking 'make dist'.
Merge pull request #74 from falconindy/master

Fix make dist