PY_CHECK_SQLITE_FUNC() adds -lsqlite3 multiple times

Bug report

The configure.ac macro PY_CHECK_SQLITE_FUNC keeps on adding -lsqlite3 over and over again. This seems to cause some problems on Emscripten with a static libsqlite3.a file.

configure:12473: checking for sqlite3.h
configure:12473: result: yes
configure:12496: gcc -c   -I$(srcdir)/Modules/_sqlite  conftest.c >&5
configure:12496: $? = 0
configure:12500: checking for sqlite3_bind_double in -lsqlite3
configure:12525: gcc -o conftest   -I$(srcdir)/Modules/_sqlite  -lsqlite3   conftest.c -lsqlite3  -ldl  >&5
configure:12525: $? = 0
configure:12534: result: yes
configure:12551: checking for sqlite3_column_decltype in -lsqlite3
configure:12576: gcc -o conftest   -I$(srcdir)/Modules/_sqlite  -lsqlite3   conftest.c -lsqlite3  -lsqlite3 -ldl  >&5
configure:12576: $? = 0
configure:12585: result: yes
...
configure:12806: checking for sqlite3_result_double in -lsqlite3
configure:12831: gcc -o conftest   -I$(srcdir)/Modules/_sqlite  -lsqlite3   conftest.c -lsqlite3  -lsqlite3 -lsqlite3 -lsqlite3 -lsqlite3 -lsqlite3 -lsqlite3 -ldl  >&5

Erlend is going to look into the problem.