[rhash] Fix error, revise dllexport/dllimport (#36950)

Pass `RHASH_XVERSION` as a number number, not as a string. General
error, but detected by Android NDK r26
~~~

vcpkg/buildtrees/rhash/src/v1.4.4-e609ae2b07.clean/librhash/rhash.c:877:10:
error: incompatible pointer to integer conversion returning 'char[1]'
from a function with result type 'rhash_uptr_t' (aka 'unsigned int')
[-Wint-conversion]
                return RHASH_XVERSION;
                       ^~~~~~~~~~~~~~
<command line>:2:24: note: expanded from macro 'RHASH_XVERSION'
#define RHASH_XVERSION ""
                       ^~
1 error generated.
~~~

Complement `dllexport` with `dllimport` for shared windows, and omit it
everywhere else.

Add missing pc file as if installed with official build system.

ports/rhash/CMakeLists.txt

@@ -1,12 +1,24 @@
 cmake_minimum_required(VERSION 3.5)
 project(rhash C)
 
+# cf. configure: RHASH_XVERSION = $(printf "0x%02x%02x%02x%02x" "$_v1" "$_v2" "$_v3" 0)
+set(RHASH_VERSION "undefined" CACHE STRING "")
+if(NOT RHASH_VERSION MATCHES [[^([0-9]+)[.]([0-9]+)[.]([0-9]+)$]])
+    message(FATAL_ERROR "Cannot derive RHASH_XVERSION from '${RHASH_VERSION}'")
+endif()
+MATH(EXPR RHASH_XVERSION "((${CMAKE_MATCH_1} * 256 + ${CMAKE_MATCH_2}) * 256 + ${CMAKE_MATCH_3}) * 256" OUTPUT_FORMAT HEXADECIMAL)
+
 file(STRINGS ${CMAKE_CURRENT_SOURCE_DIR}/Makefile RHASH_SOURCES REGEX "^SOURCES = .*$")
 string(REPLACE "SOURCES = " "" RHASH_SOURCES "${RHASH_SOURCES}")
 string(REPLACE " " ";" RHASH_SOURCES "${RHASH_SOURCES}")
-add_definitions(-DRHASH_XVERSION="${RHASH_XVERSION}")
+
 add_library(rhash ${RHASH_SOURCES})
-set_target_properties(rhash PROPERTIES COMPILE_DEFINITIONS "IN_RHASH" DEFINE_SYMBOL "RHASH_EXPORTS")
+
+target_compile_definitions(rhash PRIVATE RHASH_XVERSION=${RHASH_XVERSION})
+
+if(WIN32 AND BUILD_SHARED_LIBS)
+    target_compile_definitions(rhash PRIVATE RHASH_EXPORTS)
+endif()
 
 target_include_directories(rhash INTERFACE $<INSTALL_INTERFACE:include>)
 
@@ -25,3 +37,20 @@ install(EXPORT unofficial-rhash-config
 if(NOT RHASH_SKIP_HEADERS)
     install(FILES rhash.h rhash_torrent.h DESTINATION include)
 endif()
+
+# cf. configure
+set(LIBRHASH_PC "${CMAKE_CURRENT_BINARY_DIR}/librhash.pc")
+file(WRITE "${LIBRHASH_PC}"
+"prefix=fixup
+exec_prefix=\${prefix}
+libdir=\${prefix}/lib
+includedir=\${prefix}/include
+
+Name: librash
+Description: LibRHash shared library
+Version: ${RHASH_VERSION}
+Cflags: -I\${includedir}
+Libs: -L\${libdir} -lrhash
+")
+
+install(FILES "${LIBRHASH_PC}" DESTINATION "lib/pkgconfig")

ports/rhash/portfile.cmake

@@ -1,4 +1,3 @@
-set(RHASH_XVERSION 1.4.2)
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO rhash/RHash
@@ -11,6 +10,8 @@ file(COPY "${CMAKE_CURRENT_LIST_DIR}/CMakeLists.txt" DESTINATION "${SOURCE_PATH}
 
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}/librhash"
+    OPTIONS
+        -DRHASH_VERSION=${VERSION}
     OPTIONS_DEBUG
         -DRHASH_SKIP_HEADERS=ON
 )
@@ -18,5 +19,10 @@ vcpkg_cmake_configure(
 vcpkg_cmake_install()
 vcpkg_copy_pdbs()
 vcpkg_cmake_config_fixup(PACKAGE_NAME unofficial-rhash)
+vcpkg_fixup_pkgconfig()
+
+if(VCPKG_TARGET_IS_WINDOWS AND VCPKG_LIBRARY_LINKAGE STREQUAL "dynamic")
+    vcpkg_replace_string("${CURRENT_PACKAGES_DIR}/include/rhash.h" "# define RHASH_API" "# define RHASH_API __declspec(dllimport)")
+endif()
 
 file(INSTALL "${SOURCE_PATH}/COPYING" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}" RENAME copyright)

ports/rhash/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "rhash",
   "version": "1.4.4",
+  "port-version": 1,
   "description": "C library for computing a wide variety of hash sums",
   "homepage": "https://github.com/rhash/RHash",
   "license": "0BSD",

versions/baseline.json

@@ -7590,7 +7590,7 @@
     },
     "rhash": {
       "baseline": "1.4.4",
-      "port-version": 0
+      "port-version": 1
     },
     "rhasheq": {
       "baseline": "2023-06-17",

versions/r-/rhash.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "a3e224c21215bd63a0404550b6b396254a60635e",
+      "version": "1.4.4",
+      "port-version": 1
+    },
     {
       "git-tree": "cb7e94fe8d5d109574fd0e304e246c780f0b43c5",
       "version": "1.4.4",