Cirrus CI: Try to work around non-default libcurl dependency for ldc-profdata on Ubuntu 25.04

Author: kinke

.cirrus.yml

@@ -198,7 +198,13 @@ task:
     CI_ARCH: x86_64
     CI_OS: linux
     EXTRA_APT_PACKAGES: "gdmd llvm-dev libclang-common-20-dev lld"
-    EXTRA_CMAKE_FLAGS: "-DBUILD_SHARED_LIBS=ON -DBUILD_LTO_LIBS=ON -DD_COMPILER=gdmd -DLDC_LINK_MANUALLY=ON"
+    # need `-DCMAKE_EXE_LINKER_FLAGS=-lcurl` to work around libcurl dependency for ldc-profdata (distro LLVM apparently built with non-default LLVM_ENABLE_CURL=ON)
+    EXTRA_CMAKE_FLAGS: >-
+      -DBUILD_SHARED_LIBS=ON
+      -DBUILD_LTO_LIBS=ON
+      -DD_COMPILER=gdmd
+      -DLDC_LINK_MANUALLY=ON
+      -DCMAKE_EXE_LINKER_FLAGS=-lcurl
     PARALLELISM: 8
     # for gdmd:
     LANG: C.UTF-8