AppVeyor: Use built-in MSYS2 MinGW compilers

AppVeyor already has MinGW32 and MinGW64 flavors of GCC 5.3.0
installed under MSYS2, so there is no need to install our own builds of
MinGW.  MinGW-builds is no longer an active project, and we were getting
occasional timeouts while wgetting those files from SourceForge.
Furthermore, GCC 5.3.0 should produce faster code than GCC 4.8.1.
1 file changed
tree: 0bf108b0ecab246d52329bf9e4c08e208a3a76f1
  1. ci/
  2. cmakescripts/
  3. doc/
  4. java/
  5. md5/
  6. release/
  7. sharedlib/
  8. simd/
  9. testimages/
  10. win/
  11. .gitignore
  12. .travis.yml
  13. acinclude.m4
  14. appveyor.yml
  15. bmp.c
  16. bmp.h
  17. BUILDING.md
  18. cderror.h
  19. cdjpeg.c
  20. cdjpeg.h
  21. change.log
  22. ChangeLog.md
  23. cjpeg.1
  24. cjpeg.c
  25. CMakeLists.txt
  26. coderules.txt
  27. configure.ac
  28. djpeg.1
  29. djpeg.c
  30. doxygen-extra.css
  31. doxygen.config
  32. example.c
  33. jaricom.c
  34. jcapimin.c
  35. jcapistd.c
  36. jcarith.c
  37. jccoefct.c
  38. jccolext.c
  39. jccolor.c
  40. jcdctmgr.c
  41. jchuff.c
  42. jchuff.h
  43. jcinit.c
  44. jcmainct.c
  45. jcmarker.c
  46. jcmaster.c
  47. jcomapi.c
  48. jconfig.h.in
  49. jconfig.txt
  50. jconfigint.h.in
  51. jcparam.c
  52. jcphuff.c
  53. jcprepct.c
  54. jcsample.c
  55. jcstest.c
  56. jctrans.c
  57. jdapimin.c
  58. jdapistd.c
  59. jdarith.c
  60. jdatadst-tj.c
  61. jdatadst.c
  62. jdatasrc-tj.c
  63. jdatasrc.c
  64. jdcoefct.c
  65. jdcoefct.h
  66. jdcol565.c
  67. jdcolext.c
  68. jdcolor.c
  69. jdct.h
  70. jddctmgr.c
  71. jdhuff.c
  72. jdhuff.h
  73. jdinput.c
  74. jdmainct.c
  75. jdmainct.h
  76. jdmarker.c
  77. jdmaster.c
  78. jdmaster.h
  79. jdmerge.c
  80. jdmrg565.c
  81. jdmrgext.c
  82. jdphuff.c
  83. jdpostct.c
  84. jdsample.c
  85. jdsample.h
  86. jdtrans.c
  87. jerror.c
  88. jerror.h
  89. jfdctflt.c
  90. jfdctfst.c
  91. jfdctint.c
  92. jidctflt.c
  93. jidctfst.c
  94. jidctint.c
  95. jidctred.c
  96. jinclude.h
  97. jmemmgr.c
  98. jmemnobs.c
  99. jmemsys.h
  100. jmorecfg.h
  101. jpeg_nbits_table.h
  102. jpegcomp.h
  103. jpegint.h
  104. jpeglib.h
  105. jpegtran.1
  106. jpegtran.c
  107. jquant1.c
  108. jquant2.c
  109. jsimd.h
  110. jsimd_none.c
  111. jsimddct.h
  112. jstdhuff.c
  113. jutils.c
  114. jversion.h
  115. libjpeg.map.in
  116. libjpeg.txt
  117. LICENSE.md
  118. Makefile.am
  119. rdbmp.c
  120. rdcolmap.c
  121. rdgif.c
  122. rdjpgcom.1
  123. rdjpgcom.c
  124. rdppm.c
  125. rdrle.c
  126. rdswitch.c
  127. rdtarga.c
  128. README.ijg
  129. README.md
  130. structure.txt
  131. tjbench.c
  132. tjbenchtest.in
  133. tjbenchtest.java.in
  134. tjexampletest.in
  135. tjunittest.c
  136. tjutil.c
  137. tjutil.h
  138. transupp.c
  139. transupp.h
  140. turbojpeg-jni.c
  141. turbojpeg-mapfile
  142. turbojpeg-mapfile.jni
  143. turbojpeg.c
  144. turbojpeg.h
  145. usage.txt
  146. wizard.txt
  147. wrbmp.c
  148. wrgif.c
  149. wrjpgcom.1
  150. wrjpgcom.c
  151. wrppm.c
  152. wrppm.h
  153. wrrle.c
  154. wrtarga.c