Check for both zlib.h and -lz before enabling zlib support in the amalgamation

configure script.

FossilOrigin-Name: 8ecd13a1b38e58d4464585c388c1aa27d1f056dba0db239316623e81d3eb5284

autoconf/configure.ac

@@ -164,8 +164,9 @@ AC_SUBST(EXTRA_SHELL_OBJ)
 #-----------------------------------------------------------------------
 
 AC_CHECK_FUNCS(posix_fallocate)
-AC_CHECK_HEADERS(zlib.h)
-AC_SEARCH_LIBS(deflate,z,[ZLIB_FLAGS="-DSQLITE_HAVE_ZLIB"])
+AC_CHECK_HEADERS(zlib.h,[
+  AC_SEARCH_LIBS(deflate,z,[ZLIB_FLAGS="-DSQLITE_HAVE_ZLIB"])
+])
 AC_SUBST(ZLIB_FLAGS)
 
 #-----------------------------------------------------------------------

manifest

@@ -1,5 +1,5 @@
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-D 2018-01-18T17:09:26.634
+C Check\sfor\sboth\szlib.h\sand\s-lz\sbefore\senabling\szlib\ssupport\sin\sthe\samalgamation\nconfigure\sscript.
+D 2018-01-18T17:46:08.702
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manifest.uuid

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