configure: simplify pkg-config handling, drop other tests

Add helper function pkg_config_add() that checks for the presence of a
package and also adds cflags/ldflags if it is found. Change existing
pkg-config-using feature tests to use that. Also change the freetype
test that used a separate libfreetype-config binary before; using
pkg-config instead helps cross-compiling. Drop other kinds of checks
(such as test compiles) from these tests. It's possible that this
could cause problems on some (broken) systems, but that can't be
verified without user testing.

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