externals: Use the conan helper for boost.

This partially reverts 292dd642ce.
The real issue was the missing components in the find_package(boost) call.
This is now fixed here.

CMakeLists.txt

@@ -164,6 +164,7 @@ macro(yuzu_find_packages)
     # Capitalization matters here. We need the naming to match the generated paths from Conan
     set(REQUIRED_LIBS
     #    Cmake Pkg Prefix  Version     Conan Pkg            Components
+        "Boost             1.73        boost/1.73.0         context headers"
         "Catch2            2.13        catch2/2.13.0"
         "fmt               7.1         fmt/7.1.2"
     # can't use until https://github.com/bincrafters/community/issues/1173
@@ -236,22 +237,6 @@ macro(yuzu_find_packages)
     unset(FN_FORCE_REQUIRED)
 endmacro()
 
-find_package(Boost 1.73.0 COMPONENTS context headers QUIET)
-if (Boost_FOUND)
-    set(Boost_LIBRARIES Boost::boost)
-    # Conditionally add Boost::context only if the active version of the Conan or system Boost package provides it
-    # The old version is missing Boost::context, so we want to avoid adding in that case
-    # The new version requires adding Boost::context to prevent linking issues
-    #
-    # This one is used by Conan on subsequent CMake configures, not the first configure.
-    if (TARGET Boost::context)
-        list(APPEND Boost_LIBRARIES Boost::context)
-    endif()
-else()
-    message(STATUS "Boost 1.73.0 or newer not found, falling back to Conan")
-    list(APPEND CONAN_REQUIRED_LIBS "boost/1.73.0")
-endif()
-
 # Attempt to locate any packages that are required and report the missing ones in CONAN_REQUIRED_LIBS
 yuzu_find_packages()
 
@@ -306,17 +291,6 @@ if (CONAN_REQUIRED_LIBS)
     # this time with required, so we bail if its not found.
     yuzu_find_packages(FORCE_REQUIRED)
 
-    if (NOT Boost_FOUND)
-        find_package(Boost 1.73.0 REQUIRED COMPONENTS context headers)
-        set(Boost_LIBRARIES Boost::boost)
-        # Conditionally add Boost::context only if the active version of the Conan Boost package provides it
-        # The old version is missing Boost::context, so we want to avoid adding in that case
-        # The new version requires adding Boost::context to prevent linking issues
-        if (TARGET Boost::context)
-            list(APPEND Boost_LIBRARIES Boost::context)
-        endif()
-    endif()
-
     # Due to issues with variable scopes in functions, we need to also find_package(qt5) outside of the function
     if(ENABLE_QT)
         list(APPEND CMAKE_MODULE_PATH "${CONAN_QT_ROOT_RELEASE}")
@@ -346,6 +320,11 @@ elseif (TARGET Boost::boost)
     add_library(boost ALIAS Boost::boost)
 endif()
 
+# Some boost packages lack the context target, so let's just alias it from the global boost target.
+if (NOT TARGET Boost::context)
+    add_library(Boost::context ALIAS Boost::boost)
+endif()
+
 if (TARGET sdl2::sdl2)
     # imported from the conan generated sdl2Config.cmake
     set_target_properties(sdl2::sdl2 PROPERTIES IMPORTED_GLOBAL TRUE)

src/common/CMakeLists.txt

@@ -215,7 +215,7 @@ endif()
 
 create_target_directory_groups(common)
 
-target_link_libraries(common PUBLIC ${Boost_LIBRARIES} fmt::fmt microprofile)
+target_link_libraries(common PUBLIC Boost::boost Boost::context fmt::fmt microprofile)
 target_link_libraries(common PRIVATE lz4::lz4 xbyak)
 if (MSVC)
   target_link_libraries(common PRIVATE zstd::zstd)