[tesseract] Initial port. Closes #465

ports/tesseract/CONTROL

@@ -0,0 +1,4 @@
+Source: tesseract
+Version: 3.05.01
+Description: An OCR Engine that was developed at HP Labs between 1985 and 1995... and now at Google.
+Build-Depends: leptonica, icu

ports/tesseract/portfile.cmake

@@ -0,0 +1,49 @@
+include(vcpkg_common_functions)
+
+if (VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
+    message(STATUS "Warning: Dynamic building not supported yet. Building static.")
+    set(VCPKG_LIBRARY_LINKAGE static)
+endif()
+
+vcpkg_from_github(
+    OUT_SOURCE_PATH SOURCE_PATH
+    REPO tesseract-ocr/tesseract
+    REF 3.05.01
+    SHA512 a49c20c98386684cd89582e57b772811204fad8e5ff18214fb0da109f73629c70845054985e31e8deeb49107fbcf56e546aff661f08eb5dd60fbf83dbe976e81
+    HEAD_REF master
+)
+
+vcpkg_apply_patches(
+    SOURCE_PATH ${SOURCE_PATH}
+    PATCHES
+        ${CMAKE_CURRENT_LIST_DIR}/use-vcpkg-icu.patch
+)
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    PREFER_NINJA
+    OPTIONS
+        -DSTATIC=ON
+        -DUSE_SYSTEM_ICU=True
+)
+
+vcpkg_install_cmake()
+
+vcpkg_fixup_cmake_targets(CONFIG_PATH "cmake")
+
+# Install tool
+file(MAKE_DIRECTORY ${CURRENT_PACKAGES_DIR}/tools/tesseract)
+file(COPY ${CURRENT_PACKAGES_DIR}/bin/tesseract.exe DESTINATION ${CURRENT_PACKAGES_DIR}/tools/tesseract)
+vcpkg_copy_tool_dependencies(${CURRENT_PACKAGES_DIR}/tools/tesseract)
+
+vcpkg_copy_pdbs()
+
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/bin)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/bin)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/lib/pkgconfig)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib/pkgconfig)
+
+# Handle copyright
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/tesseract)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/tesseract/LICENSE ${CURRENT_PACKAGES_DIR}/share/tesseract/copyright)

ports/tesseract/use-vcpkg-icu.patch

@@ -0,0 +1,11 @@
+--- a/training/CMakeLists.txt	Thu Aug 17 02:46:15 2017
++++ b/training/CMakeLists.txt	Thu Aug 17 02:46:15 2017
+@@ -11,7 +11,7 @@
+ endif()
+ 
+ # experimental
+-if (MSVC AND NOT CPPAN_BUILD)
++if (MSVC AND NOT CPPAN_BUILD AND NOT USE_SYSTEM_ICU)
+ 
+ include(CheckTypeSize)
+ check_type_size("void *" SIZEOF_VOID_P)