structure: fixing build errors with gcc10+ removing unused dep (#28097)

var/spack/repos/builtin/packages/structure/package.py

@@ -15,12 +15,14 @@ class Structure(MakefilePackage):
 
     version('2.3.4', sha256='f2b72b9189a514f53e921bbdc1aa3dbaca7ac34a8467af1f972c7e4fc9c0bb37')
 
-    depends_on('jdk', type=('build', 'run'))
-
     def url_for_version(self, version):
         url = "http://web.stanford.edu/group/pritchardlab/structure_software/release_versions/v{0}/structure_kernel_source.tar.gz"
         return url.format(version)
 
+    @when('%gcc@10:')
+    def edit(self, spec, prefix):
+        filter_file(r'(CFLAGS =.*$)', '\\1 -fcommon', 'Makefile')
+
     def install(self, spec, prefix):
         mkdirp(prefix.bin)
         install('structure', prefix.bin)