update defaults to gcc 8.3.0, binutils 2.32

Makefile

@@ -2,8 +2,8 @@
 SOURCES = sources
 
 CONFIG_SUB_REV = 3d5db9ebe860
-BINUTILS_VER = 2.27
-GCC_VER = 6.4.0
+BINUTILS_VER = 2.32
+GCC_VER = 8.3.0
 MUSL_VER = 1.1.22
 GMP_VER = 6.1.1
 MPC_VER = 1.0.3