Fix two test cases

test cases/common/33 try compile/meson.build

@@ -1,11 +1,11 @@
 project('try compile', 'c', 'cpp')
 
 code = '''#include<stdio.h>
-void func() { printf("Something.\\n"); }
+void func() { printf("Something.\n"); }
 '''
 
 breakcode = '''#include<nonexisting.h>
-void func() { printf("This won't work.\\n"); }
+void func() { printf("This won't work.\n"); }
 '''
 
 foreach compiler : [meson.get_compiler('c'), meson.get_compiler('cpp')]

test cases/common/39 tryrun/meson.build

@@ -13,8 +13,8 @@ endif
 
 ok_code = '''#include<stdio.h>
 int main(int argc, char **argv) {
-  printf("%s\\n", "stdout");
+  printf("%s\n", "stdout");
-  fprintf(stderr, "%s\\n", "stderr");
+  fprintf(stderr, "%s\n", "stderr");
   return 0;
 }
 '''