Add support for xdiff (#579)

MAINTAINERS.md

@@ -110,6 +110,11 @@ We need to monitor new releases at https://docs.microsoft.com/en-us/sql/connect/
 The latest stable release of the `ssh2` PHP extension is very old, so we install the latest beta release.
 We should switch to the stable release once it will be available.
 
+## xdiff
+
+The `xdiff` PHP extension uses the LibXDiff library.
+We need to monitor new releases at http://www.xmailserver.org/xdiff-lib.html
+
 ### zookeeper
 
 The latest stable release of the `zookeeper` PHP extension doesn't support PHP 7.3+, so we install the alpha version.

data/supported-extensions

@@ -109,6 +109,7 @@ uuid 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 vips 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 wddx 5.5 5.6 7.0 7.1 7.2 7.3
 xdebug 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
+xdiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xhprof 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xlswriter 7.0 7.1 7.2 7.3 7.4 8.0 8.1
 xmldiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1

install-php-extensions

@@ -3244,6 +3244,21 @@ installRemoteModule() {
 				fi
 			fi
 			;;
+		xdiff)
+			if test -z "$installRemoteModule_version"; then
+				if test $PHP_MAJMIN_VERSION -le 506; then
+					installRemoteModule_version=1.5.2
+				fi
+			fi
+			if ! test -f /usr/local/lib/libxdiff.* && ! test -f /usr/lib/libxdiff.* && ! test -f /usr/lib/x86_64*/libxdiff.*; then
+				installRemoteModule_src="$(getPackageSource http://www.xmailserver.org/libxdiff-0.23.tar.gz)"
+				cd -- "$installRemoteModule_src"
+				./configure --disable-shared --disable-dependency-tracking --with-pic
+				make -j$(getProcessorCount)
+				make install
+				cd - >/dev/null
+			fi
+			;;
 		xhprof)
 			if test -z "$installRemoteModule_version"; then
 				if test $PHP_MAJMIN_VERSION -le 506; then