[ARM] Fix more -Wreturn-type fallout

This patch fixes a couple of more tests that are giving out warnings with -Wreturn-type:
- g++.dg/ext/pr57735.C
- gcc.target/arm/pr54300.C

*** gcc/testsuite/ChangeLog ***

2017-11-10  Sudakshina Das  <sudi.das@arm.com>

        * g++.dg/ext/pr57735.C: Add -Wno-return-type for test.
        * gcc.target/arm/pr54300.C (main): Add return type and
        return a value.

From-SVN: r254773

gcc/testsuite/ChangeLog

+2017-11-15  Sudakshina Das  <sudi.das@arm.com>
+
+	* g++.dg/ext/pr57735.C: Add -Wno-return-type for test.
+	* gcc.target/arm/pr54300.C (main): Add return type and
+	return a value.
+
 2017-11-15  Tom de Vries  <tom@codesourcery.com>
 
 	* gcc.dg/strncpy-fix-1.c: Add -Wno-stringop-truncation to dg-options.

gcc/testsuite/g++.dg/ext/pr57735.C

@@ -2,7 +2,7 @@
 /* { dg-require-effective-target arm_arch_v5te_ok } */
 /* { dg-require-effective-target arm_arm_ok } */
 /* { dg-skip-if "do not override -mfloat-abi" { *-*-* } { "-mfloat-abi=*" } {"-mfloat-abi=soft" } } */
-/* { dg-options "-march=armv5te -marm  -mtune=xscale -mfloat-abi=soft -O1" } */
+/* { dg-options "-march=armv5te -marm  -mtune=xscale -mfloat-abi=soft -O1 -Wno-return-type" } */
 
 typedef unsigned int size_t;
 __extension__

gcc/testsuite/gcc.target/arm/pr54300.C

@@ -51,6 +51,7 @@ test(unsigned short *_Inp, int32_t *_Out,
   vst1q_s32( _Out, c );
 }
 
+int
 main()
 {
   unsigned short a[4] = {1, 2, 3, 4};
@@ -58,4 +59,5 @@ main()
   test(a, b, 1, 1, ~0);
   if (b[0] != 1 || b[1] != 2 || b[2] != 3 || b[3] != 4)
     abort();
+  return 0;
 }