use more direct logic for avoiding superfluous symlinks in libgcc output

These symlinks should go into `gcc_impl_{{ cross_target_platform }}`,
so we need to delete them in libgcc-devel, which gets built first.

The more elegant
```
find ${PREFIX}/${CHOST}/lib ! -name libgcc_s.so* -type l -or -type f -exec rm -f '{}' +
```
should only delete libs and files NOT named like libgcc_s.so.*,
but somehow ends up deleting the base folder, leading to:
```
find: ‘${PREFIX}/${CHOST}/lib’: No such file or directory
```

recipe/install-libgcc-devel.sh

@@ -10,10 +10,13 @@ pushd ${SRC_DIR}/build
 
 make -C ${CHOST}/libgcc prefix=${PREFIX} install
 
-# These go into libgcc output
+# These go into libgcc-ng output
 rm -rf ${PREFIX}/lib/libgcc_s.so*
-# These go into gcc_impl
-find ${PREFIX}/${CHOST}/lib/ ! -name 'libgcc_s.so*' -type l -or -type f -exec rm -f {} +
+# Everything _except_ libgcc_s.so* in ${PREFIX}/${CHOST}/lib/ goes into gcc_impl
+mkdir ${PREFIX}/${CHOST}/lib2
+cp ${PREFIX}/${CHOST}/lib/libgcc_s.so* ${PREFIX}/${CHOST}/lib2
+rm -rf ${PREFIX}/${CHOST}/lib
+mv ${PREFIX}/${CHOST}/lib2 ${PREFIX}/${CHOST}/lib
 # This is in gcc_impl as it is gcc specific and clang has the same header
 rm -rf ${PREFIX}/lib/gcc/${CHOST}/${gcc_version}/include/unwind.h
 

recipe/meta.yaml

@@ -134,6 +134,7 @@ outputs:
         - sysroot_{{ cross_target_platform }} {{ glibc_version }}
       host:
         - sysroot_{{ cross_target_platform }} {{ glibc_version }}
+        - {{ pin_subpackage("libgcc-devel_" ~ cross_target_platform, exact=True) }}
         - {{ pin_subpackage("libgomp", exact=True) }}               # [target_platform == cross_target_platform]
         - {{ pin_subpackage("libstdcxx-ng", exact=True) }}          # [target_platform == cross_target_platform]
         - {{ pin_subpackage("libgcc-ng", exact=True) }}             # [target_platform == cross_target_platform]