Merge branch 'playmer-Add-constexpr'

ports/constexpr/CONTROL

@@ -0,0 +1,3 @@
+Source: constexpr
+Version: 1.0
+Description: Small MIT License Library of general stdlib functions written as C++11 constexpr functions.

ports/constexpr/portfile.cmake

@@ -0,0 +1,16 @@
+include(vcpkg_common_functions)
+vcpkg_download_distfile(ARCHIVE
+    URLS "https://github.com/elbeno/constexpr/archive/a98b1db39c909e0130d21d3910d4faf97035a625.zip"
+    FILENAME "constexpr-a98b1db39c909e0130d21d3910d4faf97035a625.zip"
+    SHA512 847e09f9df30cb5fbd8aa280679ff359d73c9e9454ffe3090f66975a15665080629e9a664d057f039b17430d42b5e5f5f3f92831e73c15024060991090209c2e
+)
+vcpkg_extract_source_archive(${ARCHIVE})
+
+# Put the licence file where vcpkg expects it
+set(SOURCE_DIR ${CURRENT_BUILDTREES_DIR}/src/constexpr-a98b1db39c909e0130d21d3910d4faf97035a625)
+file(COPY ${SOURCE_DIR}/LICENSE DESTINATION ${CURRENT_PACKAGES_DIR}/share/constexpr/LICENSE)
+file(RENAME ${CURRENT_PACKAGES_DIR}/share/constexpr/LICENSE ${CURRENT_PACKAGES_DIR}/share/constexpr/copyright)
+
+# Copy the constexpr header files
+file(GLOB HEADER_FILES ${SOURCE_DIR}/src/include/*.h)
+file(COPY ${HEADER_FILES} DESTINATION ${CURRENT_PACKAGES_DIR}/include)