build: remove the conditions that will never be triggered

Author: hqzing

common.gypi

@@ -535,7 +535,7 @@
                 'cflags': [ '-m64', '-mminimal-toc' ],
                 'ldflags': [ '-m64' ],
               }],
-              [ 'host_arch=="s390x" and (OS=="linux" or OS=="openharmony")', {
+              [ 'host_arch=="s390x" and OS=="linux"', {
                 'cflags': [ '-m64', '-march=z196' ],
                 'ldflags': [ '-m64', '-march=z196' ],
               }],
@@ -555,7 +555,7 @@
                 'cflags': [ '-m64', '-mminimal-toc' ],
                 'ldflags': [ '-m64' ],
               }],
-              [ 'target_arch=="s390x" and (OS=="linux" or OS=="openharmony")', {
+              [ 'target_arch=="s390x" and OS=="linux"', {
                 'cflags': [ '-m64', '-march=z196' ],
                 'ldflags': [ '-m64', '-march=z196' ],
               }],