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, 3 insertions, 0 deletions

diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c
index 33467c379..9f18a42ff 100644
--- a/src/basic/fs-util.c
+++ b/src/basic/fs-util.c
@@ -46,6 +46,9 @@
 #include "user-util.h"
 #include "util.h"
 
+/// Additional includes needed by elogind
+#include "process-util.h"
+
 int unlink_noerrno(const char *path) {
         PROTECT_ERRNO;
         int r;