Include jpeg_skip/crop_scanlines() in jpeg7.dll

... when the in-memory source/destination managers are included.
Oversight in 306e1d2 and
3ab68cf.

ChangeLog.md

@@ -16,6 +16,12 @@ was accidentally enabled by default.)
 4. libjpeg-turbo should now build and run with full AltiVec SIMD acceleration
 on PowerPC-based AmigaOS 4 and OpenBSD systems.
 
+5. Fixed build and runtime errors on Windows that occurred when building
+libjpeg-turbo with libjpeg v7 API/ABI emulation and the in-memory
+source/destination managers.  Due to an oversight, the `jpeg_skip_scanlines()`
+and `jpeg_crop_scanlines()` functions were not being included in jpeg7.dll when
+libjpeg-turbo was built with `-DWITH_JPEG7=1` and `-DWITH_MEMSRCDST=1`.
+
 
 1.5.1
 =====

win/jpeg7-memsrcdst.def

@@ -104,3 +104,5 @@ EXPORTS
 	jzero_far @ 103 ; 
 	jpeg_mem_dest @ 104 ; 
 	jpeg_mem_src @ 105 ; 
+	jpeg_skip_scanlines @ 106 ; 
+	jpeg_crop_scanline @ 107 ;