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Ticket title: "--with-nghttp2=dir looks in .../lib instead of .../lib64"

Task goals: Find a solution for the following bugzilla ticket:

Description copied from https://bz.apache.org/bugzilla/show_bug.cgi?id=59809

"when doing "./configure ... --with-nghttp2=/some/directory ...", configure, to find nghttp2's build paramaters, sets PKG_CONFIG_PATH to /some/directory/lib/pkgconfig, which is wrong for e.g. a 64bit linux system as this has it's .pc files in .../lib64/pkgconfig (and installs libraries to .../lib64). in the end, the generated build files are missing the neccessary -L/some/directory/lib64.

modules/http2/config2.m4 should be fixed so not to use unconditionally "${ap_nghttp2_base}/lib/pkgconfig/libnghttp2.pc"

btw., same problem is in acinclude.m4 in the code for --with-ssl"

Completion requirements: A github repo containing the fixed source code and the applied patch

Useful links:
https://www.thegeekstuff.com/2012/06/install-from-source/