oauth: Run Autoconf tests with correct compiler flags

Commit b0635bfda split off the CPPFLAGS/LDFLAGS/LDLIBS for libcurl into
their own separate Makefile variables, but I neglected to move the
existing AC_CHECKs for Curl into a place where they would make use of
those variables. They instead tested the system libcurl, which 1) is
unhelpful if a different Curl is being used for the build and 2) will
fail the build entirely if no system libcurl exists. Correct the order
of operations here.

Reported-by: Ivan Kush <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Reviewed-by: Ivan Kush <[email protected]>
Discussion: https://postgr.es/m/8a611028-51a1-408c-b592-832e2e6e1fc9%40tantorlabs.com
Backpatch-through: 18

0 files changed, 0 insertions, 0 deletions