### Description
ping @xkaraman
cmake is overriding distro build flags
Here is typical CFLAGS for EL distros
```
export CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g
-grecord-gcc-switches -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64-v2
-mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
-fcf-protection'
## try to build
cd build/
make
[ 1%] Building C object src/CMakeFiles/kamailio.dir/lib/srdb1/db_row.c.o
In file included from /usr/include/bits/libc-header-start.h:33,
from /usr/include/string.h:26,
from
/home/centos/src/kamailio-5.8/src/lib/srdb1/../../core/str.h:26,
from /home/centos/src/kamailio-5.8/src/lib/srdb1/db_con.h:33,
from /home/centos/src/kamailio-5.8/src/lib/srdb1/db_val.h:40,
from /home/centos/src/kamailio-5.8/src/lib/srdb1/db_row.h:37,
from /home/centos/src/kamailio-5.8/src/lib/srdb1/db_row.c:33:
/usr/include/features.h:412:4: warning: #warning _FORTIFY_SOURCE requires
compiling with optimization (-O) [-Wcpp]
412 | # warning _FORTIFY_SOURCE requires compiling with optimization (-O)
```
It is probably due to `cmake/compiler-specific.cmake`:
```
# If GCC version is greater than 4.2.0, enable the following flags
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER 4.2.0)
target_compile_options(
common INTERFACE -m64 -minline-all-stringops -falign-loops
-ftree-vectorize -fno-strict-overflow -mtune=generic
)
endif()
```
Packaging for ELx requires respecting the default flags - for EL9 included here
for reference
```
CFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64
-march=x86-64-v2 -mtune=generic -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection'
CXXFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g
-grecord-gcc-switches -pipe -Wall -Werror=format-security
-Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
-specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64-v2
-mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection
-fcf-protection'
FCFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64
-march=x86-64-v2 -mtune=generic -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
FFLAGS='-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches
-pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
-Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1
-fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64
-march=x86-64-v2 -mtune=generic -fasynchronous-unwind-tables
-fstack-clash-protection -fcf-protection -I/usr/lib64/gfortran/modules'
LDFLAGS='-Wl,-z,relro -Wl,--as-needed -Wl,-z,now
-specs=/usr/lib/rpm/redhat/redhat-hardened-ld
-specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 '
```
ELx packaging typically involves this dance:
```
# in practice RPM build tools have macros for all the following steps
# use standard distro flags
export CFLAGS=....
export CXXFLAGS=...
export LDFLAGS=....
./configure
```
Is there a way we can respect distro build flags with cmake?
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