curl: fix CVE-2023-28320 siglongjmp race condition may lead to crash

curl: fix CVE-2023-28320 siglongjmp race condition may lead to crash

Introduced by: https://github.com/curl/curl/commit/3c49b405de4fbf1fd7127f91908261268640e54f (curl-7_9_8)
Fixed by: https://github.com/curl/curl/commit/13718030ad4b3209a7583b4f27f683cd3a6fa5f2 (curl-8_1_0)
Follow-up: https://github.com/curl/curl/commit/f446258f0269a62289cca0210157cb8558d0edc3 (curl-8_1_0)
https://curl.se/docs/CVE-2023-28320.html

Signed-off-by: Vivek Kumbhar <vkumbhar@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>