fdo#47035: Fix saving of jpeg files on Mac/PPC

jpeg_compress_struct gets padded with the same effect as the
jpeg_decompress_struct, so needs some reordering as well to make Mac/PPC
happy (a27a3990)

jpeg/struct_alignment.patch

-without this patch, the jpeg_decompress_struct will be padded, this in turn
+without this patch, the jpeg_decompress_struct & jpec_compress_struct will be padded, this in turn
 results in a mismatch when the jpeg filter in svtools is built, where no
 padding is assumed. Only affects Mac/PPC apparenlty, see fdo#47035
 --- misc/jpeg-8c/jpeglib.h	2010-11-17 22:01:56.000000000 +0100
-+++ misc/build/jpeg-8c/jpeglib.h	2012-05-19 03:38:44.000000000 +0200
++++ misc/build/jpeg-8c/jpeglib.h	2012-05-19 13:58:31.000000000 +0200
+@@ -288,9 +288,9 @@
+   JDIMENSION image_width;	/* input image width */
+   JDIMENSION image_height;	/* input image height */
+   int input_components;		/* # of color components in input image */
+-  J_COLOR_SPACE in_color_space;	/* colorspace of input image */
+ 
+   double input_gamma;		/* image gamma of input image */
++  J_COLOR_SPACE in_color_space;	/* colorspace of input image */
+ 
+   /* Compression parameters --- these fields must be set before calling
+    * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
+@@ -359,16 +359,16 @@
+   /* Parameters controlling emission of special markers. */
+ 
+   boolean write_JFIF_header;	/* should a JFIF marker be written? */
++  boolean write_Adobe_marker;	/* should an Adobe marker be written? */
+   UINT8 JFIF_major_version;	/* What to write for the JFIF version number */
+   UINT8 JFIF_minor_version;
+   /* These three values are not used by the JPEG code, merely copied */
+   /* into the JFIF APP0 marker.  density_unit can be 0 for unknown, */
+   /* 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect */
+   /* ratio is defined by X_density/Y_density even when density_unit=0. */
+-  UINT8 density_unit;		/* JFIF code for pixel size units */
+   UINT16 X_density;		/* Horizontal pixel density */
+   UINT16 Y_density;		/* Vertical pixel density */
+-  boolean write_Adobe_marker;	/* should an Adobe marker be written? */
++  UINT8 density_unit;		/* JFIF code for pixel size units */
+   
+   /* State variable: index of next scanline to be written to
+    * jpeg_write_scanlines().  Application may use this to control its
 @@ -583,11 +583,11 @@
    /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */
    UINT8 JFIF_major_version;	/* JFIF version number */