src/cbang/os lacks PowerPC cpu support (Linux, macOS)

[barracuda156]

Apparently no PowerPC support at all there, not even for Linux. Maybe possible to add it or borrow from OpenBLAS, for example (which works, AFAIK, including on macOS PowePC)?

P. S. Also, on an older macOS arm64 file does not compile due to some missing defines (but I guess it can be included conditionally: we do not need anything arm64 on a powerpc anyway):

src/cbang/os/CPURegsAArch64.cpp: In function 'uint32_t {anonymous}::cpu_part()':
src/cbang/os/CPURegsAArch64.cpp:80:32: error: 'CPUSUBFAMILY_ARM_HG' was not declared in this scope; did you mean 'CPUFAMILY_ARM_11'?
   80 |     bool arm_hg = subfamily == CPUSUBFAMILY_ARM_HG;
      |                                ^~~~~~~~~~~~~~~~~~~
      |                                CPUFAMILY_ARM_11
src/cbang/os/CPURegsAArch64.cpp:82:10: error: 'CPUFAMILY_ARM_CYCLONE' was not declared in this scope; did you mean 'CPUFAMILY_ARM_XSCALE'?
   82 |     case CPUFAMILY_ARM_CYCLONE:            return 1;                // A7
      |          ^~~~~~~~~~~~~~~~~~~~~
      |          CPUFAMILY_ARM_XSCALE
src/cbang/os/CPURegsAArch64.cpp:83:10: error: 'CPUFAMILY_ARM_TYPHOON' was not declared in this scope; did you mean 'CPUFAMILY_ARM_XSCALE'?
   83 |     case CPUFAMILY_ARM_TYPHOON:            return arm_hg ? 3 : 2;   // A8X :A8
      |          ^~~~~~~~~~~~~~~~~~~~~
      |          CPUFAMILY_ARM_XSCALE
src/cbang/os/CPURegsAArch64.cpp:84:10: error: 'CPUFAMILY_ARM_TWISTER' was not declared in this scope; did you mean 'CPUFAMILY_ARM_XSCALE'?
   84 |     case CPUFAMILY_ARM_TWISTER:            return arm_hg ? 5 : 4;   // A9X :a9
      |          ^~~~~~~~~~~~~~~~~~~~~
      |          CPUFAMILY_ARM_XSCALE
src/cbang/os/CPURegsAArch64.cpp:85:10: error: 'CPUFAMILY_ARM_HURRICANE' was not declared in this scope; did you mean 'CPUFAMILY_ARM_XSCALE'?
   85 |     case CPUFAMILY_ARM_HURRICANE:          return arm_hg ? 7 : 6;   // A10X:A10
      |          ^~~~~~~~~~~~~~~~~~~~~~~
      |          CPUFAMILY_ARM_XSCALE
src/cbang/os/CPURegsAArch64.cpp:86:10: error: 'CPUFAMILY_ARM_MONSOON_MISTRAL' was not declared in this scope
   86 |     case CPUFAMILY_ARM_MONSOON_MISTRAL:    return 9;                // A11
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/cbang/os/CPURegsAArch64.cpp:87:10: error: 'CPUFAMILY_ARM_VORTEX_TEMPEST' was not declared in this scope
   87 |     case CPUFAMILY_ARM_VORTEX_TEMPEST:     return arm_hg ? 17 : 12; // A12X:A12
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/cbang/os/CPURegsAArch64.cpp:88:10: error: 'CPUFAMILY_ARM_LIGHTNING_THUNDER' was not declared in this scope
   88 |     case CPUFAMILY_ARM_LIGHTNING_THUNDER:  return 19;               // A13
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/cbang/os/CPURegsAArch64.cpp:89:10: error: 'CPUFAMILY_ARM_FIRESTORM_ICESTORM' was not declared in this scope
   89 |     case CPUFAMILY_ARM_FIRESTORM_ICESTORM: return arm_hg ? 35 : 33; // M1  :A14
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/cbang/os/CPURegsAArch64.cpp: In constructor 'cb::CPURegsAArch64::CPURegsAArch64()':
src/cbang/os/CPURegsAArch64.cpp:197:15: error: 'CPU_TYPE_ARM64' was not declared in this scope; did you mean 'CPU_TYPE_ARM'?
  197 |   if (type != CPU_TYPE_ARM64)
      |               ^~~~~~~~~~~~~~
      |               CPU_TYPE_ARM
/opt/local/bin/g++-mp-13 -o build/cbang/os/Directory.o -c -faligned-new -std=c++17 -fsigned-char -I/opt/local/libexec/boost/1.76/include -Os -arch ppc -ffunction-sections -fdata-sections -O3 -funroll-loops -fno-pie -Os -arch ppc -fPIC -DNDEBUG -D_REENTRANT -D__APPLE__ -DUSING_CBANG -Iinclude -Isrc -Isrc/boost src/cbang/os/Directory.cpp
scons: *** [build/cbang/os/CPURegsAArch64.o] Error 1