aco: Do not define NOMINMAX as it's already defined in pre_args now

It's a revert of fcd53bebe6 ("aco: Define NOMINMAX in Meson build file")
Because 852d91edcd ("windows: Always set NOMINMAX to remove min/max macros")
did the same thing

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19233>

src/amd/compiler/meson.build

@@ -82,7 +82,7 @@ libaco_files = files(
   'aco_validate.cpp',
 )
 
-cpp_args_aco = cpp.get_supported_arguments(['-fno-exceptions', '-fno-rtti', '-Wimplicit-fallthrough', '-Wshadow', '-DNOMINMAX'])
+cpp_args_aco = cpp.get_supported_arguments(['-fno-exceptions', '-fno-rtti', '-Wimplicit-fallthrough', '-Wshadow'])
 
 _libaco = static_library(
   'aco',