Check for and use chsize instead of ftruncate if present.

include/config.h.in

diff --git a/include/config.h.in b/include/config.h.in
index 4f1b63e..12f6cd8 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -32,6 +32,9 @@
 /* Define to use .string instead of .ascii */
 #undef HAVE_ASM_STRING
 
+/* Define to 1 if you have the `chsize' function. */
+#undef HAVE_CHSIZE
+
 /* Define to 1 if you have the `clone' function. */
 #undef HAVE_CLONE
 
@@ -101,6 +104,9 @@
 /* Define to 1 if you have the <freetype/tttables.h> header file. */
 #undef HAVE_FREETYPE_TTTABLES_H
 
+/* Define to 1 if you have the `ftruncate' function. */
+#undef HAVE_FTRUNCATE
+
 /* Define to 1 if you have the `ftruncate64' function. */
 #undef HAVE_FTRUNCATE64
 

include/wine/port.h

diff --git a/include/wine/port.h b/include/wine/port.h
index c161d22..d5065a4 100644
--- a/include/wine/port.h
+++ b/include/wine/port.h
@@ -104,6 +104,10 @@
 #define RTLD_GLOBAL  0x100
 #endif
 
+#if !defined(HAVE_FTRUNCATE) && defined(HAVE_CHSIZE)
+#define ftruncate chsize
+#endif
+
 #if !defined(HAVE_POPEN) && defined(HAVE__POPEN)
 #define popen _popen
 #endif