Related: rhbz#2121654 Work around pkgconfig(libpq) conflict

...between libpq-devel and postgresql-private-devel, so that the BuildRequires:
pkgconfig(libpq) would now erroneously pick up postgresql-private-devel rather
than libpq-devel at least on F36 (and which causes trouble when trying to do a
LibreOffice flatpak build, which only bundles libpq but not
postgresql-private-libs)

(cherry picked from commit 98b9b9b60e381737e4451f772e53e49d4c1998a9)

libreoffice.spec

@@ -138,6 +138,7 @@ BuildRequires: firebird-devel
 BuildRequires: glm-devel
 BuildRequires: hyphen-devel
 BuildRequires: libjpeg-turbo-devel
+BuildRequires: libpq-devel
 BuildRequires: lpsolve-devel
 BuildRequires: openldap-devel
 BuildRequires: pam-devel
@@ -170,7 +171,6 @@ BuildRequires: pkgconfig(libmspub-0.1)
 BuildRequires: pkgconfig(libmwaw-0.3)
 BuildRequires: pkgconfig(libodfgen-0.1)
 BuildRequires: pkgconfig(libpagemaker-0.0)
-BuildRequires: pkgconfig(libpq)
 BuildRequires: pkgconfig(librevenge-0.0)
 BuildRequires: pkgconfig(libstaroffice-0.0)
 BuildRequires: pkgconfig(libtiff-4)