[docopt]Enable docopt shared build on non-windows OS (#38132)

Only activate declspec import/export attributes on Windows. The
resulting header is close to CMakes suggestions:


https://cmake.org/cmake/help/latest/guide/tutorial/Selecting%20Static%20or%20Shared%20Libraries.html

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#NNNNNN." for each fixed issue on separate lines. -->

Fixes #36117

Note: I chose option B) from my post in the issue.

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If this PR updates an existing port, please uncomment and fill out this
checklist:

- [x] Changes comply with the [maintainer
guide](https://github.com/microsoft/vcpkg-docs/blob/main/vcpkg/contributing/maintainer-guide.md).
- [x] SHA512s are updated for each updated download. UNCHANGED!
- [ ] The "supports" clause reflects platforms that may be fixed by this
new version.
What is the "supports" clause?
- [x] Any fixed [CI
baseline](https://github.com/microsoft/vcpkg/blob/master/scripts/ci.baseline.txt)
entries are removed from that file.
- [x] Any patches that are no longer applied are deleted from the port's
directory.
- [x] The version database is fixed by rerunning `./vcpkg x-add-version
--all` and committing the result.
- [x] Only one version is added to each modified port's versions file.

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- [ ] Changes comply with the [maintainer
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ports/docopt/portfile.cmake

@@ -23,7 +23,7 @@ file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
 
 if(VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
     file(READ "${CURRENT_PACKAGES_DIR}/include/docopt/docopt.h" _contents)
-    string(REPLACE "#ifdef DOCOPT_DLL" "#if 1" _contents "${_contents}")
+    string(REPLACE "#ifdef DOCOPT_DLL" "#ifdef _WIN32" _contents "${_contents}")
     file(WRITE "${CURRENT_PACKAGES_DIR}/include/docopt/docopt.h" "${_contents}")
 endif()
 

ports/docopt/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "docopt",
   "version-date": "2022-03-15",
+  "port-version": 1,
   "description": "Command line arguments parser that will make you smile (C++11 port).",
   "license": "MIT OR BSL-1.0",
   "dependencies": [

versions/baseline.json

@@ -2302,7 +2302,7 @@
     },
     "docopt": {
       "baseline": "2022-03-15",
-      "port-version": 0
+      "port-version": 1
     },
     "doctest": {
       "baseline": "2.4.11",

versions/d-/docopt.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "9b5aa0bd1e02e5c3a66e56b084c951069a591151",
+      "version-date": "2022-03-15",
+      "port-version": 1
+    },
     {
       "git-tree": "98cead1c88cad77bef9acf4571d6bd8a2a06cf3a",
       "version-date": "2022-03-15",