Remove backslash alignment attempts

Right-aligning backslashes when defining macros or using complex
commands in Makefiles looks cute, but as soon as any changes is
required to the code you end up with either distractingly broken
alignment or unnecessarily big diffs where most of the changes
are just pushing all backslashes a few characters to one side.

Generated using

  $ git grep -El '[[:blank:]][[:blank:]]\\$' | \
    grep -E '*\.([chx]|am|mk)$$' | \
    while read f; do \
      sed -Ei 's/[[:blank:]]*[[:blank:]]\\$/ \\/g' "$f"; \
    done

Signed-off-by: Andrea Bolognani <abologna@redhat.com>

examples/domsuspend/suspend.c

@@ -39,7 +39,7 @@ static int debug;
  *
  *  CC       domtop.o
  *domtop.c:40:0: warning: "ERROR" redefined [enabled by default]
- * #define ERROR(...)                                              \
+ * #define ERROR(...) \
  * ^
  *In file included from /usr/i686-w64-mingw32/sys-root/mingw/include/windows.h:71:0,
  *                 from /usr/i686-w64-mingw32/sys-root/mingw/include/winsock2.h:23,
@@ -49,20 +49,20 @@ static int debug;
  * #define ERROR 0
  */
 #undef ERROR
-#define ERROR(...)                                              \
-do {                                                            \
-    fprintf(stderr, "ERROR %s:%d : ", __FUNCTION__, __LINE__);  \
-    fprintf(stderr, __VA_ARGS__);                               \
-    fprintf(stderr, "\n");                                      \
+#define ERROR(...) \
+do { \
+    fprintf(stderr, "ERROR %s:%d : ", __FUNCTION__, __LINE__); \
+    fprintf(stderr, __VA_ARGS__); \
+    fprintf(stderr, "\n"); \
 } while (0)
 
-#define DEBUG(...)                                              \
-do {                                                            \
-    if (!debug)                                                 \
-        break;                                                  \
-    fprintf(stderr, "DEBUG %s:%d : ", __FUNCTION__, __LINE__);  \
-    fprintf(stderr, __VA_ARGS__);                               \
-    fprintf(stderr, "\n");                                      \
+#define DEBUG(...) \
+do { \
+    if (!debug) \
+        break; \
+    fprintf(stderr, "DEBUG %s:%d : ", __FUNCTION__, __LINE__); \
+    fprintf(stderr, __VA_ARGS__); \
+    fprintf(stderr, "\n"); \
 } while (0)
 
 static void