Fix building Catch on macOS

[masaori335]

Checking HAVE_SYS_SYSCTL_H in catch.hpp is introduced by #6145 (3ea8301).
However, it requires including ink_autoconf.h before the check.

+ make test
Making check in src/tscpp/util
/Applications/Xcode.app/Contents/Developer/usr/bin/make  test_tscpputil
  CXX      unit_tests/test_tscpputil-unit_test_main.o
In file included from ../../../../src/tscpp/util/unit_tests/unit_test_main.cc:25:
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7114:33: error: variable has incomplete type 'struct kinfo_proc'
            struct kinfo_proc   info;
                                ^
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7114:20: note: forward declaration of 'kinfo_proc'
            struct kinfo_proc   info;
                   ^
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7125:22: error: use of undeclared identifier 'CTL_KERN'
            mib[0] = CTL_KERN;
                     ^
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7126:22: error: use of undeclared identifier 'KERN_PROC'
            mib[1] = KERN_PROC;
                     ^
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7127:22: error: use of undeclared identifier 'KERN_PROC_PID'
            mib[2] = KERN_PROC_PID;
                     ^
/Users/jenkins/workspace/macOS-master/compiler/clang/label/macOS/type/release/src/BUILDS/../tests/include/catch.hpp:7140:45: error: use of undeclared identifier 'P_TRACED'
            return ( (info.kp_proc.p_flag & P_TRACED) != 0 );
                                            ^
5 errors generated.
make[2]: *** [unit_tests/test_tscpputil-unit_test_main.o] Error 1
make[1]: *** [check-am] Error 2
make: *** [check-recursive] Error 1

[SolidWallOfCode]

Is this going to be a problem if we update Catch at some later point?

[zwoop]

@SolidWallOfCode I think the ship sailed with the previous changes. I guess we have to be cognitive about redoing this anytime we update upstream Catch.hpp.

[zwoop]

Cherry-picked to v9.0.x branch.