build-sys: use #if Y instead of #ifdef Y everywhere

The advantage is that is the name is mispellt, cpp will warn us.

$ git grep -Ee "conf.set\('(HAVE|ENABLE)_" -l|xargs sed -r -i "s/conf.set\('(HAVE|ENABLE)_/conf.set10('\1_/"
$ git grep -Ee '#ifn?def (HAVE|ENABLE)' -l|xargs sed -r -i 's/#ifdef (HAVE|ENABLE)/#if \1/; s/#ifndef (HAVE|ENABLE)/#if ! \1/;'
$ git grep -Ee 'if.*defined\(HAVE' -l|xargs sed -i -r 's/defined\((HAVE_[A-Z0-9_]*)\)/\1/g'
$ git grep -Ee 'if.*defined\(ENABLE' -l|xargs sed -i -r 's/defined\((ENABLE_[A-Z0-9_]*)\)/\1/g'
+ manual changes to meson.build

squash! build-sys: use #if Y instead of #ifdef Y everywhere

v2:
- fix incorrect setting of HAVE_LIBIDN2

1 files changed, 2 insertions, 2 deletions

diff --git a/src/delta/delta.c b/src/delta/delta.c
index b0689ffff7..605bea57bb 100644
--- a/src/delta/delta.c
+++ b/src/delta/delta.c
@@ -49,7 +49,7 @@ static const char prefixes[] =
         "/usr/local/share\0"
         "/usr/lib\0"
         "/usr/share\0"
-#ifdef HAVE_SPLIT_USR
+#if HAVE_SPLIT_USR
         "/lib\0"
 #endif
         ;
@@ -392,7 +392,7 @@ static int enumerate_dir(
 }
 
 static int should_skip_prefix(const char* p) {
-#ifdef HAVE_SPLIT_USR
+#if HAVE_SPLIT_USR
         int r;
         _cleanup_free_ char *target = NULL;