Version Control With Subversion Source

is useful for the nightly builds to respect umask. Instead, use 'cp -r'.
Switch from 'install -d' to 'mkdir -p' rather than use install in one
isolated situation.

* src/tools/Makefile.base-vars:
(INSTALL_DATA): 'install -m 644' -> 'cp -r'.
(MKDIR): 'install -d' -> 'mkdir -p'.