Change required openssl version to be >= 1.0.1

The previous requirement did not make sense.
On system that did not use pgk-config then the library happily linked
against version 1.0.1 as the required functions are present in that
version. If pkg-config was used then suddenly configure would fail with
version 1.0.1 due to the version check.

configure.in

@@ -227,7 +227,7 @@ if test "$enable_openssl" = "yes"; then
       [AC_MSG_RESULT([no])])
 
    if test "x$PKG_CONFIG" != "x"; then
-     PKG_CHECK_MODULES([crypto], [libcrypto > 1.0.1],
+     PKG_CHECK_MODULES([crypto], [libcrypto >= 1.0.1],
        [CFLAGS="$CFLAGS $crypto_CFLAGS"
         LIBS="$crypto_LIBS $LIBS"])
    else
@@ -236,11 +236,11 @@ if test "$enable_openssl" = "yes"; then
    fi
 
    AC_SEARCH_LIBS([EVP_EncryptInit], [crypto],
-     [], [AC_MSG_FAILURE([can't find openssl >1.0.1 crypto lib])])
+     [], [AC_MSG_FAILURE([can't find openssl >= 1.0.1 crypto lib])])
    AC_SEARCH_LIBS([EVP_aes_128_ctr], [crypto],
-     [], [AC_MSG_FAILURE([can't find openssl >1.0.1 crypto lib])])
+     [], [AC_MSG_FAILURE([can't find openssl >= 1.0.1 crypto lib])])
    AC_SEARCH_LIBS([EVP_aes_128_gcm], [crypto],
-     [], [AC_MSG_FAILURE([can't find openssl >1.0.1 crypto lib])])
+     [], [AC_MSG_FAILURE([can't find openssl >= 1.0.1 crypto lib])])
 
    AC_DEFINE([OPENSSL], [1], [Define this to use OpenSSL crypto.])
    AES_ICM_OBJS="crypto/cipher/aes_icm_ossl.o crypto/cipher/aes_gcm_ossl.o"