git-compat-util: really support openssl as a source of entropy

05cd988dce5 (wrapper: add a helper to generate numbers from a CSPRNG,
2022-01-17), configure openssl as the source for entropy in NON-STOP
but doesn't add the needed header or link options.

Since the only system that is configured to use openssl as a source
of entropy is NON-STOP, add the header unconditionally, and -lcrypto
to the list of external libraries.

An additional change is required to make sure a NO_OPENSSL=1 build
will be able to work as well (tested on Linux with a modified value
of CSPRNG_METHOD = openssl), and the more complex logic that allows
for compatibility with APPLE_COMMON_CRYPTO or allowing for simpler
ways to link (without libssl) has been punted for now.

Reported-by: Randall Becker <rsbecker@nexbridge.com>
Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 198b759e76..e106728194 100644
--- a/Makefile
+++ b/Makefile
@@ -1940,6 +1940,7 @@ endif
 
 ifneq ($(findstring openssl,$(CSPRNG_METHOD)),)
 	BASIC_CFLAGS += -DHAVE_OPENSSL_CSPRNG
+	EXTLIBS += -lcrypto -lssl
 endif
 
 ifneq ($(PROCFS_EXECUTABLE_PATH),)