Problem resolving relative URIs

Raised by Matthias Pigulla <mp@webfactory.de>

In a nutshell we had that bug on URI composition after some fixes in
the area of localhost empty shortcuts :

./testURI --base file:///some/where file

Without patch: file:/some/file
With patch: file:///some/file
1 file changed
tree: afdecd8ab17fe890eadd57011eeba94c3e00e0d6
  1. bakefile/
  2. doc/
  3. example/
  4. include/
  5. macos/
  6. optim/
  7. os400/
  8. python/
  9. result/
  10. test/
  11. vms/
  12. VxWorks/
  13. win32/
  14. xstc/
  15. .gitignore
  16. .travis.yml
  17. acinclude.m4
  18. AUTHORS
  19. autogen.sh
  20. buf.c
  21. buf.h
  22. build_glob.py
  23. c14n.c
  24. catalog.c
  25. ChangeLog
  26. check-relaxng-test-suite.py
  27. check-relaxng-test-suite2.py
  28. check-xinclude-test-suite.py
  29. check-xml-test-suite.py
  30. check-xsddata-test-suite.py
  31. chvalid.c
  32. chvalid.def
  33. configure.ac
  34. Copyright
  35. dbgen.pl
  36. dbgenattr.pl
  37. debugXML.c
  38. dict.c
  39. DOCBparser.c
  40. elfgcchack.h
  41. enc.h
  42. encoding.c
  43. entities.c
  44. error.c
  45. genChRanges.py
  46. gentest.py
  47. genUnicode.py
  48. global.data
  49. globals.c
  50. HACKING
  51. hash.c
  52. HTMLparser.c
  53. HTMLtree.c
  54. INSTALL.libxml2
  55. legacy.c
  56. libxml-2.0-uninstalled.pc.in
  57. libxml-2.0.pc.in
  58. libxml.3
  59. libxml.h
  60. libxml.m4
  61. libxml.spec.in
  62. libxml2-config.cmake.in
  63. libxml2.doap
  64. libxml2.syms
  65. list.c
  66. MAINTAINERS
  67. Makefile.am
  68. Makefile.tests
  69. Makefile.win
  70. nanoftp.c
  71. nanohttp.c
  72. NEWS
  73. parser.c
  74. parserInternals.c
  75. pattern.c
  76. README
  77. README.cvs-commits
  78. README.tests
  79. README.zOS
  80. regressions.py
  81. regressions.xml
  82. relaxng.c
  83. rngparser.c
  84. runsuite.c
  85. runtest.c
  86. runxmlconf.c
  87. save.h
  88. SAX.c
  89. SAX2.c
  90. schematron.c
  91. testapi.c
  92. testAutomata.c
  93. testC14N.c
  94. testchar.c
  95. testdict.c
  96. testdso.c
  97. testHTML.c
  98. testlimits.c
  99. testModule.c
  100. testOOM.c
  101. testOOMlib.c
  102. testOOMlib.h
  103. testReader.c
  104. testrecurse.c
  105. testRegexp.c
  106. testRelax.c
  107. testSAX.c
  108. testSchemas.c
  109. testThreads.c
  110. testThreadsWin32.c
  111. testURI.c
  112. testXPath.c
  113. threads.c
  114. timsort.h
  115. TODO
  116. TODO_SCHEMAS
  117. tree.c
  118. trio.c
  119. trio.h
  120. triodef.h
  121. trionan.c
  122. trionan.h
  123. triop.h
  124. triostr.c
  125. triostr.h
  126. uri.c
  127. valid.c
  128. xinclude.c
  129. xlink.c
  130. xml2-config.1
  131. xml2-config.in
  132. xml2Conf.sh.in
  133. xmlcatalog.c
  134. xmlIO.c
  135. xmllint.c
  136. xmlmemory.c
  137. xmlmodule.c
  138. xmlreader.c
  139. xmlregexp.c
  140. xmlsave.c
  141. xmlschemas.c
  142. xmlschemastypes.c
  143. xmlstring.c
  144. xmlunicode.c
  145. xmlwriter.c
  146. xpath.c
  147. xpointer.c
  148. xzlib.c
  149. xzlib.h