[RFC PATCH] http: use xmalloc with cURL

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

4a30976e28 ([PATCH] support older versions of libcurl, 2005-07-28) added
support for conditionally initializing cURL but when f0ed8226c9
(Add custom memory allocator to MinGW and MacOS builds, 2009-05-31) that
support wasn't updated to make sure cURL will use the same allocator than
git if compiled with USE_NED_ALLOCATOR=YesPlease (usually done in Windows)

tested in macOS 10.14.6 with the system provided cURL (7.54.0)
and latest (7.65.3) and while the API used should be added starting around
7.12.0 (mid 2014). couldn't get a release that old to build and therefore
the current mismatch is unlikely to be found while testing because of that.

cURL is very strict about its allocator being thread safe and so that might
be an issue to look for.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 http.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/http.h b/http.h
index b429f1cf04..59ec4cbd30 100644
--- a/http.h
+++ b/http.h
@@ -27,6 +27,9 @@
 #endif
 #if LIBCURL_VERSION_NUM < 0x070800
 #define curl_global_init(a) do { /* nothing */ } while (0)
+#else
+#define curl_global_init(a) curl_global_init_mem(a, xmalloc, free, \
+						xrealloc, xstrdup, xcalloc)
 #endif
 
 #if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
-- 
2.23.0.rc2