Export header check allows WholeStaticLibs

cc/linker.go code assumes that export_static_lib_headers can apply
regardless of whether a library is a regular or 'whole' static lib.
However, this check prevents that code from working.

Bug: 183654927
Test: use export_static_lib_headers like this
Change-Id: I680f90514e41224a7077630167ab4e481909d89c
diff --git a/cc/cc.go b/cc/cc.go
index f074597..bef89fa 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -1892,8 +1892,8 @@
 	}
 
 	for _, lib := range deps.ReexportStaticLibHeaders {
-		if !inList(lib, deps.StaticLibs) {
-			ctx.PropertyErrorf("export_static_lib_headers", "Static library not in static_libs: '%s'", lib)
+		if !inList(lib, deps.StaticLibs) && !inList(lib, deps.WholeStaticLibs) {
+			ctx.PropertyErrorf("export_static_lib_headers", "Static library not in static_libs or whole_static_libs: '%s'", lib)
 		}
 	}