Scylla build fails when coverage is enabled

[benipeled]

When building with coverage enabled, the build fails with
clang-16: error: no such file or directory: './coverage_sources.list'

Seen on CI (rebase on master) Example https://jenkins.scylladb.com/job/scylla-master/job/scylla-ci/8812

12:41:38  FAILED: absl/base/CMakeFiles/log_severity.dir/log_severity.cc.o 
12:41:38  /usr/lib64/ccache/clang++  -I/jenkins/workspace/scylla-master/scylla-ci/scylla/abseil -std=c++20 -I/jenkins/workspace/scylla-master/scylla-ci/scylla/seastar/include -I/jenkins/workspace/scylla-master/scylla-ci/scylla/build/debug/seastar/gen/include -U_FORTIFY_SOURCE -Werror=unused-result -fstack-clash-protection -fsanitize=address -fsanitize=undefined -fno-sanitize=vptr -DSEASTAR_API_LEVEL=7 -DSEASTAR_BUILD_SHARED_LIBS -DSEASTAR_SSTRING -DSEASTAR_LOGGER_COMPILE_TIME_FMT -DSEASTAR_SCHEDULING_GROUPS_COUNT=16 -DSEASTAR_DEBUG -DSEASTAR_DEFAULT_ALLOCATOR -DSEASTAR_SHUFFLE_TASK_QUEUE -DSEASTAR_DEBUG_SHARED_PTR -DSEASTAR_DEBUG_PROMISE -DSEASTAR_LOGGER_TYPE_STDOUT -DSEASTAR_TYPE_ERASE_MORE -DBOOST_NO_CXX98_FUNCTION_BASE -DFMT_SHARED -I/usr/include/p11-kit-1 -fprofile-instr-generate -fcoverage-mapping -fprofile-list=./coverage_sources.list -std=gnu++20 -Wall -Wextra -Wcast-qual -Wconversion -Wfloat-overflow-conversion -Wfloat-zero-conversion -Wfor-loop-analysis -Wformat-security -Wgnu-redeclared-enum -Winfinite-recursion -Winvalid-constexpr -Wliteral-conversion -Wmissing-declarations -Woverlength-strings -Wpointer-arith -Wself-assign -Wshadow-all -Wshorten-64-to-32 -Wsign-conversion -Wstring-conversion -Wtautological-overlap-compare -Wtautological-unsigned-zero-compare -Wundef -Wuninitialized -Wunreachable-code -Wunused-comparison -Wunused-local-typedefs -Wunused-result -Wvla -Wwrite-strings -Wno-float-conversion -Wno-implicit-float-conversion -Wno-implicit-int-float-conversion -Wno-unknown-warning-option -DNOMINMAX -MD -MT absl/base/CMakeFiles/log_severity.dir/log_severity.cc.o -MF absl/base/CMakeFiles/log_severity.dir/log_severity.cc.o.d -o absl/base/CMakeFiles/log_severity.dir/log_severity.cc.o -c /jenkins/workspace/scylla-master/scylla-ci/scylla/abseil/absl/base/log_severity.cc
12:41:38  clang-16: error: no such file or directory: './coverage_sources.list'

I guess it was caused by one of the recent changes to clang / cmake
cc @tchaikov

[mykaul]

CC @roydahan

[tchaikov]

@syuu1228 hi Takuya,

because we are building the abseil submodule with -fprofile-list option, whose argument is a relative path, and the working directory of the building process is abseil, so the path is not accessible.

if you don't mind i'd like to take care it. what do you think?