Avoid make install trying to write to folders in /usr.

diff -u -r ../cmatrix-1.2a/Makefile.in ./Makefile.in
--- ../cmatrix-1.2a/Makefile.in	2002-04-01 04:11:59.000000000 +0200
+++ ./Makefile.in	2014-03-06 22:56:09.268634166 +0100
@@ -337,7 +337,7 @@
 install-exec-am: install-binPROGRAMS
 install-exec: install-exec-am
 
-install-data-am: install-man install-data-local
+install-data-am: install-man
 install-data: install-data-am
 
 install-am: all-am