Reapply fix for EXPORT_C problem in backend.dll, which got lost in the merge - bug 2971
openssl tpkcs7(3_50_2_6734) test_log p -> d
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/testp7.pem -inform p -outform d -out c:/f.d
openssl tpkcs7(3_50_2_6734) test_log p -> p
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/testp7.pem -inform p -outform p -out c:/f.p
openssl tpkcs7(3_50_2_6734) test_log d -> d
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/f.d -inform d -outform d -out c:/ff.d1
openssl tpkcs7(3_50_2_6734) test_log p -> d
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/f.p -inform p -outform d -out c:/ff.d3
openssl tpkcs7(3_50_2_6734) test_log d -> p
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/f.d -inform d -outform p -out c:/ff.p1
openssl tpkcs7(3_50_2_6734) test_log p -> p
openssl tpkcs7(3_50_2_6734) pkcs7 -in c:/f.p -inform p -outform p -out c:/ff.p3
openssl tpkcs7(3_50_2_6734) compare c:/testp7.pem C:/f.p
openssl tpkcs7(3_50_2_6734) compare c:/testp7.pem C:/ff.p1
openssl tpkcs7(3_50_2_6734) compare c:/testp7.pem C:/ff.p3
openssl tpkcs7(3_50_2_6734) compare C:/f.p C:/ff.p1
openssl tpkcs7(3_50_2_6734) compare C:/f.p C:/ff.p3