[PATCH] src/interfaces/libpq/Makefile: fix pkg-config without openssl

Do not add openssl dependencies to libpq pkg-config file if openssl is
disabled to avoid the following build failure with libdbi-drivers raised
since commit beff361bc1edc24ee5f8b2073a1e5e4c92ea66eb:

configure: error: Package requirements (libpq) were not met:

Package 'libssl', required by 'libpq', not found
Package 'libcrypto', required by 'libpq', not found

Fixes:
- http://autobuild.buildroot.org/results/415cb61a58b928a42623ed90b0b60c59032f0a4e

Signed-off-by: Fabrice Fontaine <fontaine(dot)fabrice(at)gmail(dot)com>
---
src/interfaces/libpq/Makefile | 2 ++
1 file changed, 2 insertions(+)

diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 89bf5e0126..b5fd72a4ac 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -95,7 +95,9 @@ SHLIB_PREREQS = submake-libpgport

SHLIB_EXPORTS = exports.txt

+ifeq ($(with_ssl),openssl)
PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto
+endif

all: all-lib libpq-refs-stamp

--
2.35.1