build: Add libexpat to the crosscompile build on Windows.

The Curl plugin requires libexpat in order to work these days, so we should
download and build it in order to get the plugin enabled on Windows.

NEWS

@@ -8,6 +8,8 @@ ver 0.20.21 (not yet released)
 * playlist
   - cue: support file type declaration "FLAC" (non-standard)
 * URI schemes are case insensitive
+* Windows
+  - enable the "curl" storage plugin
 
 ver 0.20.20 (2018/05/22)
 * protocol

python/build/libs.py

@@ -364,6 +364,15 @@ curl = AutotoolsProject(
     patches='src/lib/curl/patches',
 )
 
+libexpat = AutotoolsProject(
+    'https://github.com/libexpat/libexpat/releases/download/R_2_2_6/expat-2.2.6.tar.bz2',
+    '17b43c2716d521369f82fc2dc70f359860e90fa440bea65b3b85f0b246ea81f2',
+    'lib/libexpat.a',
+    [
+        '--disable-shared', '--enable-static',
+    ],
+)
+
 libnfs = AutotoolsProject(
     'https://github.com/sahlberg/libnfs/archive/libnfs-3.0.0.tar.gz',
     '445d92c5fc55e4a5b115e358e60486cf8f87ee50e0103d46a02e7fb4618566a5',

win32/build.py

@@ -86,6 +86,7 @@ thirdparty_libs = [
     liblame,
     ffmpeg,
     curl,
+    libexpat,
     libnfs,
     boost,
 ]