added a compilation warning message for XXH_OLD_NAMES #682

Job	Run time
Linux x64 misc tests	1m 35s
Linux x64 cmake unofficial build test	15s
macos-11	31s
macos-12	36s
Linux x64 check results consistency	23s
QEMU ARM	2m 10s
QEMU AARCH64	5m 39s
QEMU PPC64LE	1m 30s
QEMU PPC64	2m 1s
QEMU S390X	2m 49s
QEMU MIPS	1m 44s
QEMU M68K	1m 36s
QEMU RISC-V	2m 5s
QEMU ARM, gcc-10	2m 2s
QEMU AARCH64, gcc-10	4m 19s
QEMU PPC64LE, gcc-10	2m 6s
QEMU PPC64, gcc-10	1m 56s
QEMU S390X, gcc-10	2m 21s
QEMU MIPS, gcc-10	1m 19s
QEMU ARM, gcc-9	1m 38s
QEMU PPC64LE, gcc-9	1m 36s
QEMU PPC64, gcc-9	1m 47s
QEMU S390X, gcc-9	2m 31s
QEMU MIPS, gcc-9	1m 27s
QEMU ARM, gcc-8	2m 15s
QEMU PPC64LE, gcc-8	1m 39s
QEMU PPC64, gcc-8	1m 50s
QEMU S390X, gcc-8	2m 9s
Ubuntu Node 16.x WebAssembly/asm.js tests	1m 2s
Ubuntu Node 17.x WebAssembly/asm.js tests	1m 10s
Ubuntu Node 18.x WebAssembly/asm.js tests	1m 14s
Windows mingw64	3m 9s
Windows mingw32	3m 29s
VC++ 2022, x64	1m 21s
VC++ 2022, Win32	1m 14s
VC++ 2022, ARM	1m 18s
VC++ 2022, ARM64	51s
VC++ 2019, x64	1m 54s
VC++ 2019, Win32	2m 1s
VC++ 2019, ARM	3m 21s
VC++ 2019, ARM64	1m 46s
CC=cc, ubuntu-latest	1m 29s
CC=gcc, ubuntu-latest	1m 21s
CC=gcc-12, ubuntu-22.04	1m 36s
CC=gcc-11, ubuntu-22.04	1m 44s
CC=gcc-10, ubuntu-22.04	1m 30s
CC=gcc-9, ubuntu-22.04	1m 57s
CC=gcc-8, ubuntu-20.04	1m 47s
CC=gcc-7, ubuntu-20.04	1m 26s
CC=clang, ubuntu-latest	1m 17s
CC=clang-12, ubuntu-22.04	1m 34s
CC=clang-11, ubuntu-22.04	2m 23s
CC=clang-10, ubuntu-20.04	1m 28s
CC=clang-9, ubuntu-20.04	1m 44s
CC=clang-8, ubuntu-20.04	1m 44s
CC=clang-7, ubuntu-20.04	1m 27s
CC=clang-6.0, ubuntu-20.04	1m 46s
	1h 43m 52s

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