Revert "libb2 overlay port shouldn't be needed anymore"

This reverts commit 107a596.

vcpkg/ports/libb2/portfile.cmake

@@ -0,0 +1,29 @@
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO BLAKE2/libb2
+    REF 2c5142f12a2cd52f3ee0a43e50a3a76f75badf85
+    SHA512 cf29cf9391ae37a978eb6618de6f856f3defa622b8f56c2d5a519ab34fd5e4d91f3bb868601a44e9c9164a2992e80dde188ccc4d1605dffbdf93687336226f8d
+    HEAD_REF master
+)
+
+set(OPTIONS)
+if(CMAKE_HOST_WIN32)
+    set(OPTIONS --disable-native) # requires cpuid
+endif()
+
+vcpkg_configure_make(
+    AUTOCONFIG
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS
+        ax_cv_check_cflags___O3=no # see https://github.com/microsoft/vcpkg/pull/17912#issuecomment-840514179
+        ${OPTIONS}
+)
+vcpkg_install_make()
+vcpkg_fixup_pkgconfig()
+
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+
+vcpkg_copy_pdbs()
+
+file(INSTALL ${SOURCE_PATH}/COPYING DESTINATION ${CURRENT_PACKAGES_DIR}/share/${PORT} RENAME copyright)

vcpkg/ports/libb2/vcpkg.json

@@ -0,0 +1,8 @@
+{
+  "name": "libb2",
+  "version": "0.98.1",
+  "port-version": 6,
+  "description": "C library providing BLAKE2b, BLAKE2s, BLAKE2bp, BLAKE2sp",
+  "homepage": "https://github.com/BLAKE2/libb2",
+  "supports": "!windows"
+}