Building curl-loader on osx 10.5.8

[Matt D. <md...@po...>]

curl-loader 0.51 fails to build due to a "cp -a" in the top-level
Makefile. Seems needlessly Linux-specific. cp -R will do the same
thing with the default values (POSIX?)

And a number of the install -c -m 644 commands fail due to the source
and target being the same file, e.g. in
build/curl/include/curl/Makefile in the install-pkgincludeHEADERS
target
I hacked around this by removing the command

make -C $(CURL_BUILD) install;

from the top level Makefile, since I only wanted a local install
anyway. But then the header files such as bits/types.h weren't found.
Oh well!

~Matt