[mozjpeg] fix build

[saucecontrol]

This fixes multiple build/install issues in current mozjpeg port

What does your PR fix?

Adds dependency for libpng, which resolves the following error on -static triplets:

CMake Error at C:/Program Files (x86)/Microsoft Visual Studio/2019/Preview/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:164 (message):
  Could NOT find PNG (missing: PNG_LIBRARY PNG_PNG_INCLUDE_DIR) (Required is at least version "1.6")
Call Stack (most recent call first):
  C:/Program Files (x86)/Microsoft Visual Studio/2019/Preview/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.17/Modules/FindPackageHandleStandardArgs.cmake:445 (_FPHSA_FAILURE_MESSAGE)
  C:/Program Files (x86)/Microsoft Visual Studio/2019/Preview/Common7/IDE/CommonExtensions/Microsoft/CMake/CMake/share/cmake-3.17/Modules/FindPNG.cmake:156 (find_package_handle_standard_args)
  C:/git/vcpkg/scripts/buildsystems/vcpkg.cmake:331 (_find_package)
  CMakeLists.txt:670 (find_package)

Fixes invalid use of vcpkg_copy_tools, which resolves the following error:

CMake Error at scripts/cmake/vcpkg_copy_tools.cmake:32 (message):
  TOOL_NAMES must be specified.
Call Stack (most recent call first):
  ports/mozjpeg/portfile.cmake:40 (vcpkg_copy_tools)
  scripts/ports.cmake:73 (include)

Fixes a typo in the CMake options that led to both static and dynamic outputs in -static triplets.

Renames the lib files to remove -static from the file names, as is done for libjpeg-turbo.

Adds pkgconfig fixups.

Cleans up patch to make only minimal changes.

Which triplets are supported/not supported? Have you updated the CI baseline?

Tested with

• x86-windows
• x86-windows-static
• x64-windows
• x64-windows-static
• x64-linux

Updated CI baseline to enable these triplets

Does your PR follow the maintainer guide?

Looks like it

[ghost]

All CLA requirements met.

[saucecontrol]

Build worked in CI but conflicts with libjpeg-turbo. I've re-disabled them in CI and added a comment to explain why they're skipped.

[strega-nil]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).