To avoid dependency on libtool/libltdl, change "*.la" extension to "*.so".

This patch comes from in-house.  It has not been submitted upstream; plans

unclear.

--- ImageMagick-6.8.3/magick/module.c.~1~	2012-12-07 05:14:16.000000000 -0800

+++ ImageMagick-6.8.3/magick/module.c	2015-02-10 20:31:54.595614457 -0800

@@ -72,7 +72,7 @@

   Define declarations.

 */

 #if defined(MAGICKCORE_LTDL_DELEGATE)

-#  define ModuleGlobExpression "*.la"

+#  define ModuleGlobExpression "*.so"

 #else

 #  if defined(_DEBUG)

 #    define ModuleGlobExpression "IM_MOD_DB_*.dll"

@@ -1453,7 +1453,7 @@

   (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",tag);

   assert(name != (char *) NULL);

 #if defined(MAGICKCORE_LTDL_DELEGATE)

-  (void) FormatLocaleString(name,MaxTextExtent,"%s.la",tag);

+  (void) FormatLocaleString(name,MaxTextExtent,"%s.so",tag);

   (void) LocaleLower(name);

 #else

 #if defined(MAGICKCORE_WINDOWS_SUPPORT)

@@ -1504,7 +1504,7 @@

 #if !defined(MAGICKCORE_LTDL_DELEGATE)

   (void) FormatLocaleString(name,MaxTextExtent,"%s.dll",tag);

 #else

-  (void) FormatLocaleString(name,MaxTextExtent,"%s.la",tag);

+  (void) FormatLocaleString(name,MaxTextExtent,"%s.so",tag);

 #endif

 }