Update to fontconfig 2.15.0. tested by ajacoutot@ and tb@

Author: mherrb

Diff for: dist/fontconfig/NEWS

@@ -0,0 +1,30 @@
+# Fontconfig
+
+Font configuration and customization library
+
+[[_TOC_]]
+
+## About Fontconfig
+
+Fontconfig can:
+
+* discover new fonts when installed automatically, removing a common source of configuration problems.
+* perform font name substitution, so that appropriate alternative fonts can be selected if fonts are missing.
+* identify the set of fonts required to completely cover a set of languages.
+* have GUI configuration tools built as it uses an XML-based configuration file (though with autodiscovery, we believe this need is minimized).
+* efficiently and quickly find the fonts you need among the set of fonts you have installed, even if you have installed thousands of fonts, while minimizing memory usage.
+* be used in concert with the X Render Extension and [FreeType](https://www.freedesktop.org/wiki/Software/FreeType/) to implement high quality, anti-aliased and subpixel rendered text on a display.
+
+Fontconfig does not:
+
+* render the fonts themselves (this is left to FreeType or other rendering mechanisms)
+* depend on the X Window System in any fashion, so that printer only applications do not have such dependencies
+
+## Documentation
+
+* [Fontconfig User Documentation](https://www.freedesktop.org/software/fontconfig/fontconfig-user.html)
+* [Fontconfig Developer Documentation](https://www.freedesktop.org/software/fontconfig/fontconfig-devel/)
+
+## Bug report
+
+If you have cncountered any issues regarding to Fontconfig, please file an issue at [GitLab issue tracker](https://gitlab.freedesktop.org/fontconfig/fontconfig/issues)

Diff for: dist/fontconfig/README

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
+<fontconfig>
+  <description>Use lcdnone as default for LCD filter</description>
+<!--  Use lcdnone as default for LCD filter -->
+  <match target="pattern">
+    <!--
+      This sort of configuration is available on the major desktop environments
+      and we don't have to break it with "assign" unconditionally. however, we
+      want to set something for others. So we use "append" here to get this working
+      in both cases so that most clients would takes a look at the first place only.
+    -->
+    <edit mode="append" name="lcdfilter">
+      <const>lcdnone</const>
+    </edit>
+  </match>
+</fontconfig>

Diff for: dist/fontconfig/README.md

@@ -53,6 +53,13 @@ NOTE: The (URW)++ fonts mappings of generics to specifics were removed, because
 <!-- Map specifics to generics -->
 
 	<!-- PostScript -->
+	<alias binding="same">
+	  <family>Helvetica LT Std</family>
+	  <default>
+	  <family>Helvetica</family>
+	  </default>
+	</alias>
+
 	<alias binding="same">
 	  <family>Nimbus Sans L</family>
 	  <default>
@@ -109,6 +116,13 @@ NOTE: The (URW)++ fonts mappings of generics to specifics were removed, because
 	  </default>
 	</alias>
 
+	<alias binding="same">
+	  <family>Courier Std</family>
+	  <accept>
+	  <family>Courier</family>
+	  </accept>
+	</alias>
+
 	<alias binding="same">
 	  <family>Nimbus Mono L</family>
 	  <default>
@@ -495,6 +509,13 @@ NOTE: The (URW)++ fonts mappings of generics to specifics were removed, because
 <!-- Map generics to specifics -->
 
 	<!-- PostScript -->
+	<alias binding="same">
+	  <family>Helvetica</family>
+	  <accept>
+	  <family>Helvetica LT Std</family>
+	  </accept>
+	</alias>
+
 	<alias binding="same">
 	  <family>Helvetica</family>
 	  <accept>
@@ -524,9 +545,9 @@ NOTE: The (URW)++ fonts mappings of generics to specifics were removed, because
 	</alias>
 
 	<alias binding="same">
-	  <family>Courier Std</family>
-	  <accept>
 	  <family>Courier</family>
+	  <accept>
+	  <family>Courier Std</family>
 	  </accept>
 	</alias>