configure: Fix test for ability to link with ICU libraries.

[Scott Bambrough]

Modified search for ICU libraries.  Now search user defined directory 
(if defined in ICU_LIB_DIR),/usr/local/lib and /usr/lib (in that order). 
  Now search for:
1) user defined libraries if defined in one or both of ICUUC_LIB and 
ICUDATA_LIB
2) libsicuuc.so, libsicudata.so
3) libicuuc.so, libicudata.so

---

  configure.ac |  101 
++++++++++++++++++++++++++++++++++++++++++++++++++++------
  1 files changed, 90 insertions(+), 11 deletions(-)

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