[SCons] Apply "target" to dependencies.

Dependencies used to be built with the default option (release for
OpenSSL, debug for libdachannel).
They now follow the desired target (producing smaller binaries in
release, and bigger in debug).

Author: Faless

builders.py

@@ -63,6 +63,9 @@ def ssl_action(target, source, env):
         "--prefix=%s" % install_dir,
         "--openssldir=%s" % install_dir,
     ]
+    if env["target"] == "debug":
+        args.append("-d")
+
     if env["platform"] != "windows":
         args.append("no-shared")  # Windows "app" doesn't like static-only builds.
     if env["platform"] == "linux":
@@ -160,6 +163,7 @@ def rtc_action(target, source, env):
         "-DOPENSSL_INCLUDE_DIR=%s" % get_ssl_include_dir(env),
         "-DOPENSSL_SSL_LIBRARY=%s/libssl.a" % get_ssl_build_dir(env),
         "-DOPENSSL_CRYPTO_LIBRARY=%s/libcrypto.a" % get_ssl_build_dir(env),
+        "-DCMAKE_BUILD_TYPE=%s" % ("Release" if env["target"] == "release" else "Debug"),
     ]
     if env["platform"] == "android":
         abi = {