Configure problem (and fix).

I have come across a problem where the code generated by autoconf does not 
subsitute correct values for the following variables:

	bindir		sbindir		libexecdir
	datadir		sysconfdir	sharedstatedir
	localstatedir	libdir		includedir
	oldincludedir	infodir		mandir

The problem is that they reference the variables, 'prefix' and 'exec_prefix' 
but those variables are not expanded in the subsitutions.  For example, 
referencing 'libdir' in an *.in file will have "${exec_prefix}/lib" placed in 
the resulting output file.  It should be "/usr/local/pgsql/lib" (if the 
default exec_prefix (and prefix) value is used).  The first patch 
(uw7-1.patch) will correct the problem, which causes an incorrect 
src/pl/plpgsql/src/mklang.sql file to be generated.

The second patch:

    1.  Adds a file (mklang.sql) that can be used to add the language
        definitions for PL/TCL to a database.

    2.  Generalizes the mklang.sql in src/pl/plpgsql/test so that it will
        reference the correct location for the plpgsql.so shared library.

    3.  Generalizes the test_mklang.sql file in src/pl/tcl/test so that is will
        reference the correct localtion for the pltcl.so shared library.

IMPORTANT: Do not apply the second patch without applying the first patch!