rescaler_mips32: disable ImportRowShrink

this function is failing the 'accum == 0' assert on skia bots for
rescaling to 13x13

BUG=skia:6682

Change-Id: I9f9f3adf28cec63ad6e38ed3128f18825d5b70cc

ChangeLog

@@ -1,3 +1,5 @@
+20a7fea0 extras/Makefile.am: fix libwebpextras.la reference
+415f3ffe update ChangeLog (tag: v0.6.0-rc3)
 3c6d1224 update NEWS
 ee4a4141 update AUTHORS
 32ed856f Fix "all|no frames are keyframes" settings.

extras/Makefile.am

@@ -22,5 +22,5 @@ get_disto_LDADD += $(PNG_LIBS) $(JPEG_LIBS) $(TIFF_LIBS)
 webp_quality_SOURCES  = webp_quality.c
 webp_quality_CPPFLAGS = $(AM_CPPFLAGS) $(USE_EXPERIMENTAL_CODE)
 webp_quality_LDADD  = ../imageio/libimageio_util.la
-webp_quality_LDADD += ./libwebpextras.la
+webp_quality_LDADD += libwebpextras.la
 webp_quality_LDADD += ../src/libwebp.la

src/dsp/rescaler_mips32.c

@@ -279,7 +279,8 @@ extern void WebPRescalerDspInitMIPS32(void);
 
 WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPS32(void) {
   WebPRescalerImportRowExpand = ImportRowExpand;
-  WebPRescalerImportRowShrink = ImportRowShrink;
+  // WebPRescalerImportRowShrink = ImportRowShrink;
+  (void)ImportRowShrink;
   WebPRescalerExportRowExpand = ExportRowExpand;
   WebPRescalerExportRowShrink = ExportRowShrink;
 }