Build: Include validate_map.sh in the distribution.

It's required by "make mydist".

Fix also the location of EXTRA_DIST+= so that those files
get distributed also if symbol versioning isn't enabled.

src/liblzma/Makefile.am

@@ -26,8 +26,8 @@ liblzma_la_CPPFLAGS = \
 	-DTUKLIB_SYMBOL_PREFIX=lzma_
 liblzma_la_LDFLAGS = -no-undefined -version-info 5:99:0
 
+EXTRA_DIST += liblzma.map validate_map.sh
 if COND_SYMVERS
-EXTRA_DIST += liblzma.map
 liblzma_la_LDFLAGS += \
 	-Wl,--version-script=$(top_srcdir)/src/liblzma/liblzma.map
 endif