Change linker script to support C++ exceptions

See:
https://github.com/espressif/esp-idf/issues/459
https://github.com/jcmvbkbc/crosstool-NG/issues/54

ld/program.ld

@@ -253,10 +253,13 @@ SECTIONS
     *(.gnu.linkonce.r.*)
     __XT_EXCEPTION_TABLE__ = ABSOLUTE(.);
     *(.xt_except_table)
-    *(.gcc_except_table)
+    *(.gcc_except_table .gcc_except_table.*)
     *(.gnu.linkonce.e.*)
     *(.gnu.version_r)
-    *(.eh_frame)
+    . = (. + 3) & ~ 3;
+    __eh_frame = ABSOLUTE(.);
+    KEEP(*(.eh_frame))
+    . = (. + 7) & ~ 3;
     . = ALIGN(4);
     *(.dynamic)
     *(.gnu.version_d)