Makefile: use curl-config --cflags

We add the result of "curl-config --libs" when linking curl programs,
but we never bother calling "curl-config --cflags". Presumably nobody
noticed because:

  - a system libcurl installed into /usr/include/curl wouldn't need any
    flags ("/usr/include" is already in the search path, and the
    #include lines all look <curl/curl.h>, etc).

  - using CURLDIR sets up both the includes and the library path

However, if you prefer CURL_CONFIG to CURLDIR, something simple like:

  make CURL_CONFIG=/path/to/curl-config

doesn't work. We'd link against the libcurl specified by that program,
but not find its header files when compiling.

Let's invoke "curl-config --cflags" similar to the way we do for
"--libs". Note that we'll feed the result into BASIC_CFLAGS. The rest of
the Makefile doesn't distinguish which files need curl support during
compilation and which do not. That should be OK, though. At most this
should be adding a "-I" directive, and this is how CURLDIR already
behaves. And since we follow the immediate-variable pattern from
CURL_LDFLAGS, we won't accidentally invoke curl-config once per
compilation.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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