gnu: commencement: Rationalize search path handling.

This commit ensures that only packages that correspond to compilers have
a search path set.  It also reduces manual handling of search path
environment variables.

* gnu/packages/commencement.scm (tcc-boot0)[native-search-paths]: Remove
copy/pasted comment.
(gcc-core-mesboot)[arguments]: In 'install2' phase, do not copy
TCC/include to OUT/include.
[native-search-paths]: Remove leading slash in "lib/gcc-lib/…" directory name.
(mesboot-headers)[native-search-paths]: Remove.
(glibc-mesboot0)[native-search-paths]: Remove.
(gcc-mesboot0)[native-inputs]: Reorder so that we have libc, then
kernel-headers, then gcc.
[arguments]: Rewrite 'setenv' phase to only set CONFIG_SHELL and create
'config.cache'.
(gcc-mesboot1)[native-inputs]: Reorder similarly.
[arguments]: In 'setenv' phase, only set CONFIG_SHELL, C_INCLUDE_PATH,
and CPLUS_INCLUDE_PATH.
(glibc-headers-mesboot)[arguments]: In 'setenv' phase, replace
references to '%build-inputs' by references to 'inputs'; simplify
setting of CONFIG_SHELL and SHELL; simplify patching of /bin/pwd in
the "configure" file; leave C_INCLUDE_PATH and LIBRARY_PATH unset.
(glibc-mesboot)[native-search-paths]: Remove.
(gcc-mesboot)[native-inputs]: Reorder.
[arguments]: Remove clause for #:phases that would change the 'setenv'
phase.

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