pgsql: Add explicit configure-time checks for perl.h and libperl.so.

Add explicit configure-time checks for perl.h and libperl.so.

Although most platforms seem to package Perl in such a way that these files
are present even in basic Perl installations, Debian does not. Hence, make
an effort to fail during configure rather than build if --with-perl was
given and these files are lacking. Per gripe from Josh Berkus.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/1f3ed51f8e197e9bbf18737a1aa1148ed730f7d8

Modified Files
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configure | 125 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
configure.in | 24 +++++++++++
2 files changed, 149 insertions(+), 0 deletions(-)

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