[wt] fix HPDF::HPDF link error

[toge]

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I met compilation errors on linking wt.
This PR tries to fix it.

CMake Error at build/vcpkg_installed/x64-linux/share/wt/wt-target-wt.cmake:61 (set_target_properties):
  The link interface of target "Wt::Wt" contains:

    HPDF::HPDF

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

[dg0yt]

It would prefer to collapse the three chunks to a single:

Suggested change

	@@ -275,8 +275,7 @@ find_package(GLEW)
	find_package(Asciidoctor)
	-set(HPDF_ROOT ${HARU_PREFIX})
	-find_package(HPDF)
	+find_package(unofficial-libharu CONFIG REQUIRED)
	set(OPENSSL_ROOT_DIR ${SSL_PREFIX})
	find_package(OpenSSL)
	@@ -578,7 +577,7 @@ IF(NOT EXISTS ${CONFIGDIR}/wt_config.xml)
	INSTALL(FILES ${WT_BINARY_DIR}/wt_config.xml DESTINATION ${CONFIGDIR})
	ENDIF (NOT EXISTS ${CONFIGDIR}/wt_config.xml)
	-if(ENABLE_HARU AND HPDF_FOUND)
	+if(ENABLE_HARU)
	set(HAVE_HARU ON)
	set(WT_HAS_WPDFIMAGE true)
	endif()
	diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
	index 4033d78..939d8aa 100644
	--- a/src/CMakeLists.txt
	+++ b/src/CMakeLists.txt
	@@ -654,7 +654,7 @@ if(HAVE_HARU)
	# Even though WPdfImage.h exposes <hpdf.h>, we mark it as private here, because most users of Wt don't need it.
	# We don't want to include it in the INTERFACE_LINK_LIBRARIES in the generated wt-target-wt.cmake file, since
	# FindHPDF.cmake is not a standard find module.
	- target_link_libraries(wt PRIVATE HPDF::HPDF)
	+ target_link_libraries(wt PRIVATE unofficial::libharu::hpdf)
	else()
	message("** Disabling PDF support (WPdfImage, WPdfRenderer): requires libharu.")
	if(ENABLE_HARU)
	@@ -275,8 +275,8 @@ find_package(GLEW)
	find_package(Asciidoctor)
	-set(HPDF_ROOT ${HARU_PREFIX})
	-find_package(HPDF)
	+find_package(HPDF NAMES unofficial-libharu CONFIG REQUIRED)
	+add_library(HPDF::HPDF ALIAS unofficial::libharu::hpdf)
	set(OPENSSL_ROOT_DIR ${SSL_PREFIX})
	find_package(OpenSSL)

[toge]

@dg0yt
Thanks lot!
It has become very simple and easier to maintain.

[dg0yt]

Some day they will use find_dependency() ;-)

[vicroms]

Please apply dg0yt's suggestions

[BillyONeal]

Thanks!

Suggestions were applied