Add APR port

ports/apr/CONTROL

@@ -0,0 +1,3 @@
+Source: apr
+Version: 1.5.2
+Description: The Apache Portable Runtime (APR) is a C library that forms a system portability layer that covers many operating systems.

ports/apr/portfile.cmake

@@ -0,0 +1,34 @@
+# Common Ambient Variables:
+#   VCPKG_ROOT_DIR = <C:\path\to\current\vcpkg>
+#   TARGET_TRIPLET is the current triplet (x86-windows, etc)
+#   PORT is the current port name (zlib, etc)
+#   CURRENT_BUILDTREES_DIR = ${VCPKG_ROOT_DIR}\buildtrees\${PORT}
+#   CURRENT_PACKAGES_DIR  = ${VCPKG_ROOT_DIR}\packages\${PORT}_${TARGET_TRIPLET}
+#
+
+include(${CMAKE_TRIPLET_FILE})
+include(vcpkg_common_functions)
+set(SOURCE_PATH ${CURRENT_BUILDTREES_DIR}/src/apr-1.5.2)
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://www.apache.org/dist/apr/apr-1.5.2.tar.bz2"
+    FILENAME "apr-1.5.2.tar.bz2"
+    SHA512 d1156ad16abf07887797777b56c2147c890f16d8445829b3e3b4917950d24c5fd2f8febd439992467a5ea0511da562c0fb4a7cfd8a235ab55882388bfa2b919d
+)
+vcpkg_extract_source_archive(${ARCHIVE})
+
+vcpkg_configure_cmake(
+    SOURCE_PATH ${SOURCE_PATH}
+    OPTIONS -DINSTALL_PDB=OFF -DMIN_WINDOWS_VER=Windows7 -DAPR_HAVE_IPV6=ON
+    # OPTIONS -DUSE_THIS_IN_ALL_BUILDS=1 -DUSE_THIS_TOO=2
+    # OPTIONS_RELEASE -DOPTIMIZE=1
+    # OPTIONS_DEBUG -DDEBUGGABLE=1
+)
+
+vcpkg_install_cmake()
+
+# There is no way to suppress installation of the headers and resource files in build.
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
+
+# Handle copyright
+file(COPY ${SOURCE_PATH}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/apr)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/apr/LICENSE ${CURRENT_PACKAGES_DIR}/share/apr/copyright)