curlhttpsrc: Don't use CURLINFO_CONTENT_LENGTH_DOWNLOAD_T
curlhttpsrc: Don't use CURLINFO_CONTENT_LENGTH_DOWNLOAD_T
The difference between CURLINFO_CONTENT_LENGTH_DOWNLOAD_T and
CURLINFO_CONTENT_LENGTH_DOWNLOAD is the variable type only.
Revert "curl: Require libcurl 7.55.0"
This reverts commit 8106fd1a646e7c744a7b0f86ed1b0b824849638d.
Since we can avoid the use of CURLINFO_CONTENT_LENGTH_DOWNLOAD_T,
this version bumping is not required.