missing TARGET_ARCH in documentation for implicit rules

[Dominik Kuhlen]

Hi,

the documentation for implicit rules says for compiling C/C++ 
$(CC) $(CPPFLAGS) $(CFLAGS) -c
$(CXX) $(CPPFLAGS) $(CXXFLAGS) -c

but the source says
default.c:479: "COMPILE.c", "$(CC) $(CFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c",
default.c:483: "COMPILE.cc", "$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(TARGET_ARCH) -c",

the attached patch fixes the documentation for these two rules.
also $(CPPFLAGS) and $(CFLAGS) are swapped (should not be an issue in most 
cases).

I think there are more rules that use $(TARGET_ARCH) without being mentioned in 
the docs.

Regards,
  Dominik

correct_implicit_rules.patch
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