Actually drop support for FreeTDS < 1.0

`DBSETUTF16` has only been introduced with v1.0.

Author: andyundso

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 * Drop support for Ruby < 2.7
 * Drop support for SQL Server < 2017
-* Drop support for FreeTDS < 0.95
+* Drop support for FreeTDS < 1.0
 
 ## 2.1.7
 * Add Ruby 3.3 to the cross compile list

ISSUE_TEMPLATE.md

@@ -2,7 +2,7 @@
 
 * On Windows? If so, do you need devkit for your ruby install?
 * Using Ubuntu? If so, you may have forgotten to install FreeTDS first.
-* Are you using FreeTDS 0.95.80 or later? Check `$ tsql -C` to find out.
+* Are you using FreeTDS 1.0.0 or later? Check `$ tsql -C` to find out.
 * If not, please update then uninstall the TinyTDS gem and re-install it.
 * Have you made sure to [enable SQL Server authentication](http://bit.ly/1Kw3set)?
 * Doing work with threads and the raw client? Use the ConnectionPool gem?

ext/tiny_tds/extconf.rb

@@ -84,7 +84,7 @@ def do_help
 end
 
 unless have_dependencies
-  abort 'Failed! Do you have FreeTDS 0.95.80 or higher installed?'
+  abort 'Failed! Do you have FreeTDS 1.0.0 or higher installed?'
 end
 
 create_makefile('tiny_tds/tiny_tds')

ext/tiny_tds/extconsts.rb

@@ -5,11 +5,5 @@
 OPENSSL_VERSION = ENV['TINYTDS_OPENSSL_VERSION'] || '1.1.1s'
 OPENSSL_SOURCE_URI = "https://www.openssl.org/source/openssl-#{OPENSSL_VERSION}.tar.gz"
 
-FREETDS_VERSION = ENV['TINYTDS_FREETDS_VERSION'] || "1.1.24"
-FREETDS_VERSION_INFO = Hash.new { |h,k|
-  h[k] = {files: "http://www.freetds.org/files/stable/freetds-#{k}.tar.bz2"}
-}
-FREETDS_VERSION_INFO['1.00'] = {files: 'http://www.freetds.org/files/stable/freetds-1.00.tar.bz2'}
-FREETDS_VERSION_INFO['0.99'] = {files: 'http://www.freetds.org/files/current/freetds-dev.0.99.678.tar.gz'}
-FREETDS_VERSION_INFO['0.95'] = {files: 'http://www.freetds.org/files/stable/freetds-0.95.92.tar.gz'}
-FREETDS_SOURCE_URI = FREETDS_VERSION_INFO[FREETDS_VERSION][:files]
+FREETDS_VERSION = ENV['TINYTDS_FREETDS_VERSION'] || '1.1.24'
+FREETDS_SOURCE_URI = "http://www.freetds.org/files/stable/freetds-#{FREETDS_VERSION}.tar.bz2"