Merge bitcoin-core/secp256k1#1011: ci: Enable -g if we set CFLAGS manually

72de1359e953390dc2f1ab5a59dd1a4057000acb ci: Enable -g if we set CFLAGS manually (Tim Ruffing)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 72de1359e953390dc2f1ab5a59dd1a4057000acb

Tree-SHA512: 0456db0ba53410640653e5d11ee4f328be0657e1e9077aa982ed4fd3eb6e326cfc022ec7ab71fc5c62d7942a20bbc7a5e8000cf5b62201fa1c183853d899ea77

.cirrus.yml

@@ -293,8 +293,8 @@ task:
         TEST_ITERS: 16
     - name: "UBSan, ASan, LSan"
       env:
-        CFLAGS: "-fsanitize=undefined,address"
-        CFLAGS_FOR_BUILD: "-fsanitize=undefined,address"
+        CFLAGS: "-fsanitize=undefined,address -g"
+        CFLAGS_FOR_BUILD: "-fsanitize=undefined,address -g"
         UBSAN_OPTIONS: "print_stacktrace=1:halt_on_error=1"
         ASAN_OPTIONS: "strict_string_checks=1:detect_stack_use_after_return=1:detect_leaks=1"
         LSAN_OPTIONS: "use_unaligned=1"
@@ -329,7 +329,7 @@ task:
     # ./configure correctly errors out when given CC=g++.
     # We hack around this by passing CC=g++ only to make.
     CC: gcc
-    MAKEFLAGS: -j2 CC=g++ CFLAGS=-fpermissive
+    MAKEFLAGS: -j2 CC=g++ CFLAGS=-fpermissive\ -g
     WERROR_CFLAGS:
     EXPERIMENTAL: yes
     ECDH: yes