Use require !skip_shlib_tests

This changes some tests to use "require !skip_shlib_tests".  This patch
cleans up a few spots that were missed in the earlier patch.

gdb/testsuite/gdb.base/attach-pie-misread.exp

@@ -14,8 +14,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # This test only works on GNU/Linux.
-require !use_gdb_stub isnative
-if { [is_remote host] || ![istarget *-linux*] || [skip_shlib_tests]} {
+require !use_gdb_stub isnative !skip_shlib_tests
+if { [is_remote host] || ![istarget *-linux*] } {
     return
 }
 

gdb/testsuite/gdb.base/break-interp.exp

@@ -14,8 +14,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 # This test only works on GNU/Linux.
-require !use_gdb_stub isnative
-if { [is_remote host] || ![istarget *-linux*] || [skip_shlib_tests]} {
+require !use_gdb_stub isnative !skip_shlib_tests
+if { [is_remote host] || ![istarget *-linux*] } {
     return
 }
 

gdb/testsuite/gdb.base/info-fun.exp

@@ -12,7 +12,8 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if { [skip_shlib_tests] || [is_remote target] } {
+require !skip_shlib_tests
+if { [is_remote target] } {
     return 0
 }
 

gdb/testsuite/gdb.base/prelink.exp

@@ -19,8 +19,8 @@
 # This file was written by Alexandre Oliva <aoliva@redhat.com>
 
 
-require isnative
-if { [is_remote host] || [skip_shlib_tests]} {
+require isnative !skip_shlib_tests
+if { [is_remote host] } {
     return
 }
 

gdb/testsuite/gdb.base/skip-solib.exp

@@ -20,8 +20,8 @@
 #
 
 # This only works on GNU/Linux.
-require isnative
-if { [is_remote host] || ![istarget *-linux*] || [skip_shlib_tests]} {
+require isnative !skip_shlib_tests
+if { [is_remote host] || ![istarget *-linux*] } {
     return
 }
 

gdb/testsuite/gdb.base/solib-search.exp

@@ -16,7 +16,8 @@
 # Test solib-search-path, and in the case of solib-svr4.c whether l_addr_p
 # is properly reset when the path is changed.
 
-if {[is_remote target] || [skip_shlib_tests]} {
+require !skip_shlib_tests
+if {[is_remote target]} {
     untested "skipping remote target and shared library tests"
     return -1
 }