branches/5.1:

Merge changes from MySQL:

  ChangeSet@1.2645, 2007-12-19 13:24:43+00:00, jperkin@chorlton.adsl.perkin.org.uk +14 -0
    Add new pkgplugindir handling to seperate plugins from libraries,
    and allow override for binary distributions.  Extend mysql_config
    to print compiled-in plugin location for third-party plugins to
    use.  Resolves bug#31736.

and

  ChangeSet@1.2646, 2008-01-02 13:00:46+00:00, jperkin@chorlton.adsl.perkin.org.uk +11 -0
    Use pkglibdir to simplify pkgplugindir, and fix the path in a
    couple of Makefiles.  Continuation of the fix for bug#31736.

Makefile.am

@@ -19,6 +19,7 @@ MYSQLDATAdir =          $(localstatedir)
 MYSQLSHAREdir =         $(pkgdatadir)
 MYSQLBASEdir=           $(prefix)
 MYSQLLIBdir=            $(pkglibdir)
+pkgplugindir =		$(pkglibdir)/plugin
 INCLUDES =              -I$(top_srcdir)/include -I$(top_builddir)/include \
 			-I$(top_srcdir)/regex \
 			-I$(top_srcdir)/storage/innobase/include \
@@ -160,7 +161,7 @@ libinnobase_a_CFLAGS  =	$(AM_CFLAGS)
 EXTRA_LTLIBRARIES =	ha_innodb.la
 pkglib_LTLIBRARIES =	@plugin_innobase_shared_target@
 
-ha_innodb_la_LDFLAGS =	-module -rpath $(MYSQLLIBdir)
+ha_innodb_la_LDFLAGS =	-module -rpath $(pkgplugindir)
 ha_innodb_la_CXXFLAGS=	$(AM_CFLAGS) $(INNODB_DYNAMIC_CFLAGS)
 ha_innodb_la_CFLAGS  =	$(AM_CFLAGS) $(INNODB_DYNAMIC_CFLAGS)
 ha_innodb_la_SOURCES =	$(libinnobase_a_SOURCES)