Update databases/ruby-pg to 0.9.0.

* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Update HOMEPAGE.
* Correct LICENSE.
* Remove default value of GEM_BUILD.

CHANGES:

158[tip]  872063e42b12  2010-02-19 08:02 -0800  ged
  Adding "fat gem" compatible loader, set the default RUBY_CC_VERSION.

157  ab525ca90531  2010-02-19 06:27 -0800  ged
  Updated the Rakefile so it includes itself in gems. (closes #15) Thanks to flameeyes@bitbucket for

156  9c65eb905416  2010-02-18 06:52 -0800  ged
  Applied patch for PGconn#async_exec to make it have the same semantics as PGconn#exec (closes #19). Thanks again to Lars Kanis for the patch.

155  b0017ac0ecb5  2010-02-17 15:30 -0800  ged
  Updated the Rakefile to always default the package version even if a version can't be read from the VERSION_FILE.

154  c7d5458af696  2010-02-17 06:23 -0800  ged
  Improving spec database setup function (closes #18). Thanks to Lars Kanis for another fine patch.

153  39b11474d035  2010-02-17 06:14 -0800  ged
  Ack! Removing typo

152  9d54bbc98488  2010-02-17 06:10 -0800  ged
  Adding a test to ensure the result encoding remains the same even when client_encoding in the connection changes.

151  31afece7c203  2010-01-18 09:15 -0800  ged
  Made the 'make_header' in the extconf more clear.

150:149,148  d9c920068712  2010-01-13 20:56 -0800  pgsql
  Merged

149:141  294eb6d5530b  2010-01-13 20:51 -0800  pgsql
  In rspec tests, replace the pattern:

148  74fab32c2687  2010-01-11 08:15 -0800  ged
  A better fix for the PGconn#block weirdness on Win32 (closes #16).

147  f8dfc1b6c51c  2010-01-06 06:17 -0800  ged
  Rearranged the sections of the README.

146  0df792de2a19  2010-01-05 08:48 -0800  ged
  Updating MacOS X README.

145  2894973bc63f  2010-01-04 18:28 -0800  ged
  Work around broken rb_thread_select() on win32; thanks to Lars Kanis for the patch!

144  88dacdb9c97d  2010-01-04 18:16 -0800  ged
  Reverted removal of PGresult::InvalidOid, fixed broken spec.

143  739cec560448  2010-01-04 17:55 -0800  ged
  Ignore some generated files, documentation work, removed type OID constants.

142  38a0d2a90664  2010-01-04 17:39 -0800  ged
  Applied patch for static cross-compilation of win32 gem from Lars Kanis with a few changes to

141  f31202539234  2010-01-03 11:40 -0800  ged
  Updated build system

(taca)