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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master

Details
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http://git.postgresql.org/pg/commitdiff/a61b6b7d184dc7aa2475eb4d293990404be5fedd

Modified Files
--------------
src/Makefile.global.in            |    2 +-
src/Makefile.shlib                |    2 +-
src/interfaces/ecpg/test/Makefile |    2 +-
src/test/isolation/Makefile       |    2 +-
4 files changed, 4 insertions(+), 4 deletions(-)