Build with tcmalloc as system allocator

Implement new build flag and use it in Debian.

Testing

I don't have a system to benchmark and validate if performance improved, but at least I can validate that libtcmalloc.so.4 is being used.

# mariadb -e "SHOW GLOBAL VARIABLES LIKE 'version_malloc_library';"
+------------------------+----------+
| Variable_name          | Value    |
+------------------------+----------+
| version_malloc_library | tcmalloc |
+------------------------+----------+

# ldd /usr/sbin/mariadbd 
	linux-vdso.so.1 (0x00007ffe5c9c2000)
	libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 (0x00007fb3e33b3000)
	libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007fb3e3377000)
	liburing.so.2 => /lib/x86_64-linux-gnu/liburing.so.2 (0x00007fb3e336f000)
	libaio.so.1t64 => /lib/x86_64-linux-gnu/libaio.so.1t64 (0x00007fb3e336a000)
	libnuma.so.1 => /lib/x86_64-linux-gnu/libnuma.so.1 (0x00007fb3e335b000)
	libsystemd.so.0 => /lib/x86_64-linux-gnu/libsystemd.so.0 (0x00007fb3e3240000)
	libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007fb3e3220000)
	libssl.so.3 => /lib/x86_64-linux-gnu/libssl.so.3 (0x00007fb3e3112000)
	libcrypto.so.3 => /lib/x86_64-linux-gnu/libcrypto.so.3 (0x00007fb3e2ada000)
	libtcmalloc.so.4 => /lib/x86_64-linux-gnu/libtcmalloc.so.4 (0x00007fb3e28de000)
	libstdc++.so.6 => /lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007fb3e2668000)
	libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fb3e2576000)
	libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007fb3e2549000)
	libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fb3e2353000)
	/lib64/ld-linux-x86-64.so.2 (0x00007fb3e583b000)
	libcap.so.2 => /lib/x86_64-linux-gnu/libcap.so.2 (0x00007fb3e2347000)
	libzstd.so.1 => /lib/x86_64-linux-gnu/libzstd.so.1 (0x00007fb3e227d000)
	libunwind.so.8 => /lib/x86_64-linux-gnu/libunwind.so.8 (0x00007fb3e225e000)
	liblzma.so.5 => /lib/x86_64-linux-gnu/liblzma.so.5 (0x00007fb3e222d000)