toolchain: fix libgcc ABI for libc

libc depends on knowing libgcc's ABI, so it needs to be evaluated first.
Otherwise libc will depend on an ABI-less libgcc causing the rest of the
toolchain to fail.

Building package index...
ERROR: unable to select packages:
  libgcc (virtual):
    note: please select one of the 'provided by'
          packages explicitly
    provided by: libgcc1
    required by: world[libgcc]

Before:

libc fused dependencies: libgcc
libgcc fused dependencies:
libatomic fused dependencies: libgcc1

After:

libgcc fused dependencies:
libc fused dependencies: libgcc1
libatomic fused dependencies: libgcc1

Signed-off-by: George Sapkin <[email protected]>
Link: openwrt/openwrt#21265
(cherry picked from commit 5e32bfb)
Link: openwrt/openwrt#21253
Signed-off-by: Robert Marko <[email protected]>

Author: GeorgeSapkin

package/libs/toolchain/Makefile

@@ -781,8 +781,9 @@ else
 
 endif
 
-$(eval $(call BuildPackage,libc))
 $(eval $(call BuildPackage,libgcc))
+# libc depends on knowing libgcc's ABI, so it needs to be evaluated first
+$(eval $(call BuildPackage,libc))
 $(eval $(call BuildPackage,libatomic))
 $(eval $(call BuildPackage,libquadmath))
 $(eval $(call BuildPackage,libstdcpp))