build: detect Coverity 5.3.0

Coverity 5.3.0 still outputs lots of COVERITY_* variables, but no
longer modifies COVERITY_BUILD_COMMAND in the environment.  Pick
one that seems likely to stay around.

* configure.ac (STATIC_ANALYSIS): Detect newer Coverity.

configure.ac

@@ -2389,7 +2389,9 @@ cp -f COPYING.LIB COPYING
 
 # Detect when running under the clang static analyzer's scan-build driver
 # or Coverity-prevent's cov-build.  Define STATIC_ANALYSIS accordingly.
-test -n "${CCC_ANALYZER_ANALYSIS+set}$COVERITY_BUILD_COMMAND" && t=1 || t=0
+t=0
+test -n "${CCC_ANALYZER_ANALYSIS+set}" && t=1
+test -n "$COVERITY_BUILD_COMMAND$COVERITY_LD_PRELOAD" && t=1
 AC_DEFINE_UNQUOTED([STATIC_ANALYSIS], [$t],
   [Define to 1 when performing static analysis.])