Update fltk-config.in (minor comment changes only)

fltk-config.in

@@ -2,7 +2,7 @@
 #
 # FLTK configuration utility.
 #
-# Copyright 2000-2024 by Bill Spitzak and others.
+# Copyright 2000-2025 by Bill Spitzak and others.
 # Original version Copyright 2000 by James Dean Palmer
 # Adapted by Vincent Penne and Michael Sweet
 #
@@ -17,7 +17,7 @@
 #      https://www.fltk.org/bugs.php
 #
 
-# Variables and constants generated by configure or CMake:
+# Variables and constants generated by CMake:
 
 # version numbers
 MAJOR_VERSION=@FLTK_VERSION_MAJOR@
@@ -41,7 +41,7 @@ OPTIM="@OPTIM@"
 CAIROFLAGS="@CAIROFLAGS@"
 
 # BINARY_DIR: this is only set for CMake builds in the CMake build directory,
-# otherwise it is an empty string
+# otherwise it is an empty string (for instance in the install directory)
 BINARY_DIR=@BINARY_DIR@
 
 prefix="@prefix@"