cpluspluscheck: Update include path

Some things in src/include/fe_utils require libpq headers, so add
libpq's include path to the command line used here.

diff --git a/src/tools/pginclude/cpluspluscheck b/src/tools/pginclude/cpluspluscheck
index eedfc8520b030659fd91038d8345f20737eb8c8d..3a771c48b62860c90d46c9ed555a430f9978b473 100755 (executable)
--- a/src/tools/pginclude/cpluspluscheck
+++ b/src/tools/pginclude/cpluspluscheck
@@ -36,5 +36,5 @@ do
            echo '};'
        } >$tmp/test.cpp
 
-       ${CXX:-g++} -I . -I src/include -fsyntax-only -Wall -c $tmp/test.cpp
+       ${CXX:-g++} -I . -I src/interfaces/libpq -I src/include -fsyntax-only -Wall -c $tmp/test.cpp
 done