pgsql: Fix assorted issues with build and install paths containing spac

Fix assorted issues with build and install paths containing spaces.

Apparently there is no buildfarm critter exercising this case after all,
because it fails in several places. With this patch, build, install,
check-world, and installcheck-world pass for me on OS X.

Branch
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REL8_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/1f5e6cd90590742f4344e423826dae09306d755b

Modified Files
--------------
config/mkinstalldirs | 8 +++++---
src/Makefile.shlib | 2 +-
src/makefiles/pgxs.mk | 2 +-
src/pl/plperl/GNUmakefile | 2 +-
src/pl/plpython/Makefile | 2 +-
src/pl/tcl/Makefile | 2 +-
src/test/regress/GNUmakefile | 12 ++++++------
7 files changed, 16 insertions(+), 14 deletions(-)