XCodeLegacy.sh: update history section

XcodeLegacy.sh

@@ -24,8 +24,8 @@
 # 1.8 (07/04/2016): add options to install only some SDKs or compilers only
 # 1.9 (16/09/2016): Xcode 8 dropped 10.11 SDK, get it from Xcode 7.3.1
 # 2.0 (02/05/2017): Xcode 8 cannot always link i386 for OS X 10.5, use the Xcode 3 linker for this arch too. Force use of legacy assembler with GCC 4.x.
-# 2.1KC (26/10/2017): Added support to extract OS X 10.12 from Xcode 8.2.1 for use on Xcode 9/OS X 10.13
-# 2.2NB (10/01/2019): Added support for using macOS High Sierra 10.13 SDK from Xcode 9.4.1 for use on Xcode 10/macOS 10.14 Mojave, also changed source of OS X 10.12 SDK to Xcode 8.3.3
+# 2.1 (17/01/2017): Xcode 9 dropped 10.12 SDK, get it from https://github.com/phracker/MacOSX-SDKs; fix compiling with GNU Ada, and many other fixes
+# 2.2 (12/02/2019): Added support for using macOS High Sierra 10.13 SDK from Xcode 9.4.1 for use on Xcode 10/macOS 10.14 Mojave, also changed source of OS X 10.12 SDK to Xcode 8.3.3
 
 #set -e # Exit immediately if a command exits with a non-zero status
 #set -u # Treat unset variables as an error when substituting.