disable NSS/GPGMEPP dependent code.

--- poppler/poppler/Form.cc.orig	2023-06-05 19:29:14.000000000 +0900
+++ poppler/poppler/Form.cc	2023-06-17 16:51:27.873431500 +0900
@@ -64,7 +64,7 @@
 #include "Form.h"
 #include "PDFDoc.h"
 #include "DateInfo.h"
-#include "CryptoSignBackend.h"
+/*#include "CryptoSignBackend.h"*/
 #include "SignatureInfo.h"
 #include "CertificateInfo.h"
 #include "XRef.h"
@@ -577,7 +577,7 @@
 {
     return static_cast<FormFieldSignature *>(field)->validateSignature(doVerifyCert, forceRevalidation, validationTime, ocspRevocationCheck, enableAIA);
 }
-
+#if 0
 // update hash with the specified range of data from the file
 static bool hashFileRange(FILE *f, CryptoSign::SigningInterface *handler, Goffset start, Goffset end)
 {
@@ -607,10 +607,12 @@
     delete[] buf;
     return true;
 }
+#endif
 
 bool FormWidgetSignature::signDocument(const std::string &saveFilename, const std::string &certNickname, const std::string &password, const GooString *reason, const GooString *location, const std::optional<GooString> &ownerPassword,
                                        const std::optional<GooString> &userPassword)
 {
+#if 0
     auto backend = CryptoSign::Factory::createActive();
     if (!backend) {
         return false;
@@ -698,6 +700,8 @@
     fclose(file);
 
     return true;
+#endif
+    return false;
 }
 
 bool FormWidgetSignature::signDocumentWithAppearance(const std::string &saveFilename, const std::string &certNickname, const std::string &password, const GooString *reason, const GooString *location,
@@ -2316,6 +2320,7 @@
 
 void FormFieldSignature::hashSignedDataBlock(CryptoSign::VerificationInterface *handler, Goffset block_len)
 {
+#if 0
     if (!handler) {
         return;
     }
@@ -2335,6 +2340,7 @@
             i += BLOCK_SIZE;
         }
     }
+#endif
 }
 
 FormSignatureType FormWidgetSignature::signatureType() const
@@ -2349,6 +2355,7 @@
 
 SignatureInfo *FormFieldSignature::validateSignature(bool doVerifyCert, bool forceRevalidation, time_t validationTime, bool ocspRevocationCheck, bool enableAIA)
 {
+#if 0
     auto backend = CryptoSign::Factory::createActive();
     if (!backend) {
         return signature_info;
@@ -2425,6 +2432,7 @@
     const CertificateValidationStatus cert_val_state = signature_handler->validateCertificate(std::chrono::system_clock::from_time_t(validationTime), ocspRevocationCheck, enableAIA);
     signature_info->setCertificateValStatus(cert_val_state);
 
+#endif
     return signature_info;
 }