add ppc toolchain description

Author: serge-sans-paille

.github/toolchains/gcc-powerpc-linux-gnu.cmake

@@ -0,0 +1,5 @@
+set(CMAKE_SYSTEM_PROCESSOR powerpc)
+set(triple powerpc-linux-gnu)
+
+include(${CMAKE_CURRENT_LIST_DIR}/gcc.cmake)
+

.github/workflows/cross.yml .github/workflows/cross-arm.yml.github/workflows/cross.yml renamed to .github/workflows/cross-arm.yml

@@ -13,7 +13,6 @@ jobs:
           - { platform: 'arm',     arch: 'armv7-a', dir: 'arm-linux-gnueabihf', flags: '-mfpu=neon', full: 'ON'}
           - { platform: 'arm',     arch: 'armv7-a', dir: 'arm-linux-gnueabihf', flags: '-mfpu=vfpv3-d16', full: 'OFF' } # no neon
           - { platform: 'aarch64', arch: 'armv8-a', dir: 'aarch64-linux-gnu', flags: '', full: 'ON' }
-          - { platform: 'ppc', arch: 'powerpc', dir: 'powerpc-linux-gnu', flags: '-maltivec', full: 'OFF' }
         sys:
           - { compiler: 'gcc',   version: '10' }
     steps: