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enforce some c89 restrictions

Block "for (int i;;)" style declarations.

Use --std=gnu89 to avoid enforcing c89-style comments.

Change-Id: Ia7d1405eac647d04e92513c047773695e8d7dc6e

--- a/configure

+++ b/configure

@@ -625,6 +625,9 @@

         if enabled mips || [ -z "${INLINE}" ]; then

           enabled extra_warnings || check_add_cflags -Wno-unused-function

         fi

+        # Enforce c89 for c files. Don't be too strict about it though. Allow

+        # gnu extensions like "//" for comments.

+        check_cflags -std=gnu89 && add_cflags_only -std=gnu89

         # Avoid this warning for third_party C++ sources. Some reorganization

         # would be needed to apply this only to test/*.cc.

         check_cflags -Wshorten-64-to-32 && add_cflags_only -Wshorten-64-to-32