Fixed the overwriting of dependency files in automake/autoconf based build systems #129
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When calling "make -nB" (as done by compiledb) on a automake based build system all automatic dependency tracking files ".Po" (and ".Plo" for libtool libraries) are reset to the content "# dummy". Hence, after running compiledb and changing a header file nothing gets rebuild when "make" is called since all header dependencies are lost.
This patch avoids the overwriting of these files by using the existing "hack" of intercepting config.status.