Updated dependencies to the latest releases (openssl and ffmpeg) in a dockerfile, turned on building libpng

* Don't build unused Qt features; use all cores

* cmake does bootstrapping, too; comment unclear steps

* Use Docker comment syntax

* tab to space

* Added OpenSSL & different protocol support to FFmpeg backend
- Fixed Docker dependencies (both x86 & x86-64)
- Fixes bug #204

* Additional Fixes
- updates to OpenSSL build from scratch
- removed specific protocol
- Added neccessary dependency

* Fixed ./Configure command

* Updates for docker images:
- Added perl build from scratch
- Fixed wrong/redundant dependencies/paths
- Fixed & updated openssl installation

* Fixed Empty continuation lines bug & added comments

* fix inconsitent spacing

* Don't add perl 5.10 to PATH

* fix syntax error

* Fixed OpenSSL build fails in i686 Dockerfile due to buggy perl source

* Fixing manylinux docker entrypoint for i686 in 32 bit images

* ENTRYPOINT not needed, it only affects "docker run" invocations

* manylinux1 provides better libcurl for cmake

* manylinux1 provides the toolchain and git

git install fails in i686, too

* cleanup tar invocations

* nasm is not installed in manylinux1

* detect i686 in openssl configure

* move perl to a separate subtree as it's a private dependency

* rm it after library build

* comment unusual openssl build step

* avoid redundant work in perl build

* build each library in a separate dockerfile command for easier debugging

* comment custom i686 step

* update dockerfile README

* opencv now bundles libjpeg-turbo

and the separate's onre buid fails dueto expired certificate at https://kent.dl.sourceforge.net

* Don't build unused Qt features; use all cores

* cmake does bootstrapping, too; comment unclear steps

* Use Docker comment syntax

* tab to space

* Added OpenSSL & different protocol support to FFmpeg backend
- Fixed Docker dependencies (both x86 & x86-64)
- Fixes bug #204

* Additional Fixes
- updates to OpenSSL build from scratch
- removed specific protocol
- Added neccessary dependency

* Fixed ./Configure command

* Updates for docker images:
- Added perl build from scratch
- Fixed wrong/redundant dependencies/paths
- Fixed & updated openssl installation

* Fixed Empty continuation lines bug & added comments

* fix inconsitent spacing

* Don't add perl 5.10 to PATH

* fix syntax error

* Fixed OpenSSL build fails in i686 Dockerfile due to buggy perl source

* Fixing manylinux docker entrypoint for i686 in 32 bit images

* ENTRYPOINT not needed, it only affects "docker run" invocations

* manylinux1 provides better libcurl for cmake

* manylinux1 provides the toolchain and git

git install fails in i686, too

* cleanup tar invocations

* nasm is not installed in manylinux1

* detect i686 in openssl configure

* move perl to a separate subtree as it's a private dependency

* rm it after library build

* comment unusual openssl build step

* avoid redundant work in perl build

* build each library in a separate dockerfile command for easier debugging

* comment custom i686 step

* update dockerfile README

* opencv now bundles libjpeg-turbo

and the separate's onre buid fails dueto expired certificate at https://kent.dl.sourceforge.net

Fixes ccache not found in yum
[skip ci]

[skip ci]