cmake: add openssl to the private deps list when it's the TLS implementation

We might want OpenSSL to be the implementation for SHA-1 and/or TLS. If we only
want it for TLS (e.g. we're building with the collision-detecting SHA-1
implementation) then we did not indicate this to the systems including us a
static library.

Add OpenSSL to the list also during the TLS decision to make sure we say we
should link to it if we use it for TLS.

src/CMakeLists.txt

@@ -184,6 +184,7 @@ IF (USE_HTTPS)
 		LIST(APPEND LIBGIT2_INCLUDES ${OPENSSL_INCLUDE_DIR})
 		LIST(APPEND LIBGIT2_LIBS ${OPENSSL_LIBRARIES})
 		LIST(APPEND LIBGIT2_PC_LIBS ${OPENSSL_LDFLAGS})
+		LIST(APPEND LIBGIT2_PC_REQUIRES "openssl")
 	ELSEIF (HTTPS_BACKEND STREQUAL "WinHTTP")
 		# WinHTTP setup was handled in the WinHTTP-specific block above
 	ELSE()