Fix uClibc build for noMMU target

uclibc_backend_once tries to build dummy shared libraries regardless of
whether shared libraries support for target is enabled or not, resulting
in build failure in noMMU bFLT configuration.
Only build dummy shared libraries when shared library support for target
is enabled.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

scripts/build/libc/uClibc.sh

@@ -153,20 +153,22 @@ uClibc_backend_once()
             CT_DoExecLog ALL make ${jflag} "${make_args[@]}" \
                 lib/crt1.o lib/crti.o lib/crtn.o
 
-            # From:  http://git.openembedded.org/cgit.cgi/openembedded/commit/?id=ad5668a7ac7e0436db92e55caaf3fdf782b6ba3b
-            # libm.so is needed for ppc, as libgcc is linked against libm.so
-            # No problem to create it for other archs.
-            CT_DoLog EXTRA "Building dummy shared libs"
-            CT_DoExecLog ALL "${CT_TARGET}-${CT_CC}" -nostdlib -nostartfiles \
-                -shared ${multi_flags} -x c /dev/null -o libdummy.so
-
-            CT_DoLog EXTRA "Installing start files"
-            CT_DoExecLog ALL install -m 0644 lib/crt1.o lib/crti.o lib/crtn.o \
-                                             "${startfiles_dir}"
-
-            CT_DoLog EXTRA "Installing dummy shared libs"
-            CT_DoExecLog ALL install -m 0755 libdummy.so "${startfiles_dir}/libc.so"
-            CT_DoExecLog ALL install -m 0755 libdummy.so "${startfiles_dir}/libm.so"
+            if [ "${CT_SHARED_LIBS}" = "y" ]; then
+                # From:  http://git.openembedded.org/cgit.cgi/openembedded/commit/?id=ad5668a7ac7e0436db92e55caaf3fdf782b6ba3b
+                # libm.so is needed for ppc, as libgcc is linked against libm.so
+                # No problem to create it for other archs.
+                CT_DoLog EXTRA "Building dummy shared libs"
+                CT_DoExecLog ALL "${CT_TARGET}-${CT_CC}" -nostdlib -nostartfiles \
+                    -shared ${multi_flags} -x c /dev/null -o libdummy.so
+
+                CT_DoLog EXTRA "Installing start files"
+                CT_DoExecLog ALL install -m 0644 lib/crt1.o lib/crti.o lib/crtn.o \
+                                                 "${startfiles_dir}"
+
+                CT_DoLog EXTRA "Installing dummy shared libs"
+                CT_DoExecLog ALL install -m 0755 libdummy.so "${startfiles_dir}/libc.so"
+                CT_DoExecLog ALL install -m 0755 libdummy.so "${startfiles_dir}/libm.so"
+            fi # CT_SHARED_LIBS == y
         fi # CT_THREADS == nptl
     fi # libc_mode == startfiles