* ./ipkg/Makefile.in: removed a file handled by automake.
* ./configure.ac.in: additional warning flags for GCC. -Wconversion Warn if a prototype causes a type conversion that is different from what would happen to the same argument in the absence of a proto- type. -Wsign-compare Warn when a comparison between signed and unsigned values could produce an incorrect result when the signed value is converted to unsigned. -Wunreachable-code Warn if the compiler detects that code will never be executed. -Wdisabled-optimization Warn if a requested optimization pass is disabled. See the gcc documentation for more explanations. This triggers a lot of warnings everywhere, and at first sight they're all worth fixing. Code quality matters, too, so let's fix'em :)