FindOpenSSL: fix detection of OpenSSL 1.0.2

Closes #14284

(cherry picked from commit 9ffeb58d094ddba9bffb33a79b33ade9af9f5c00)

cmake/macros/FindOpenSSL.cmake

@@ -186,7 +186,7 @@ if (OPENSSL_INCLUDE_DIR)
     set(OPENSSL_VERSION "${_OPENSSL_VERSION}")
   else (_OPENSSL_VERSION)
     file(STRINGS "${OPENSSL_INCLUDE_DIR}/openssl/opensslv.h" openssl_version_str
-         REGEX "^#define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x[0-9][0-9][0-9][0-9][0-9][0-9].*")
+         REGEX "^# *define[\t ]+OPENSSL_VERSION_NUMBER[\t ]+0x[0-9][0-9][0-9][0-9][0-9][0-9].*")
 
     # The version number is encoded as 0xMNNFFPPS: major minor fix patch status
     # The status gives if this is a developer or prerelease and is ignored here.