With pkgconfig < 0.28 output is a single space
With pkgconfig = 0.28 output is an empty string,
This breaks the test on the 2 vars

Need to split when
LIB set (ex -lssl -lcrypto)
INC empty (because /usr/include used)
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  With pkgconfig < 0.28 output is a single space With pkgconfig = 0.28 output is an empty string, This breaks the test on the 2 vars