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

to "*.so"

-----------------------------------------------------------------

--- ImageMagick-6.9.4/magick/module.c.~1~	2016-05-09 10:28:58.000000000 -0700

+++ ImageMagick-6.9.4/magick/module.c	2016-05-10 08:56:44.350751083 -0700

@@ -74,7 +74,7 @@

   Define declarations.

 */

 #if defined(MAGICKCORE_LTDL_DELEGATE)

-#  define ModuleGlobExpression "*.la"

+#  define ModuleGlobExpression "*.so"

 #else

 #  if defined(_DEBUG)

 #    define ModuleGlobExpression "IM_MOD_DB_*.dll"

@@ -1482,7 +1482,7 @@

   (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)

@@ -1533,7 +1533,7 @@

 #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

 }