GH-47099: [C++][Parquet] parquet/platform.h is missing pragma warning(pop)

[behrisch]

Rationale for this change

The missing pragma is causing warnings downstream see #47099

What changes are included in this PR?

Adding the missing pragma warning(pop)

Are these changes tested?

I hope for the CI to do that ;-)

Are there any user-facing changes?

The developer should see less warnings otherwise, no.

• GitHub Issue: [C++][Parquet] parquet/platform.h is missing pragma warning(pop) #47099

[github-actions]

⚠️ GitHub issue #47099 has been automatically assigned in GitHub to PR creator.

[wgtmac]

Could you try to add following code to fix https://ci.appveyor.com/project/ApacheSoftwareFoundation/arrow/builds/52408405

diff --git a/cpp/src/parquet/exception.h b/cpp/src/parquet/exception.h
index 46f5595dd1..55b769c978 100644
--- a/cpp/src/parquet/exception.h
+++ b/cpp/src/parquet/exception.h
@@ -84,7 +84,7 @@
 
 namespace parquet {
 
-class ParquetException : public std::exception {
+class PARQUET_EXPORT ParquetException : public std::exception {
  public:
   PARQUET_NORETURN static void EofException(const std::string& msg = "") {
     static std::string prefix = "Unexpected end of stream";