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

2 files changed, 2 insertions, 2 deletions

diff --git a/shell-completion/bash/meson.build b/shell-completion/bash/meson.build
index 684d1b5c2..de467101a 100644
--- a/shell-completion/bash/meson.build
+++ b/shell-completion/bash/meson.build
@@ -46,7 +46,7 @@ if bashcompletiondir != 'no'
                 ]
 
         foreach item : items
-                if item[1] == '' or conf.get(item[1], false)
+                if item[1] == '' or conf.get(item[1]) == 1
                         install_data(item[0],
                                      install_dir : bashcompletiondir)
                 endif
diff --git a/shell-completion/zsh/meson.build b/shell-completion/zsh/meson.build
index 4ddafe2a6..be30ebf0e 100644
--- a/shell-completion/zsh/meson.build
+++ b/shell-completion/zsh/meson.build
@@ -43,7 +43,7 @@ if zshcompletiondir != 'no'
                 ]
 
         foreach item : items
-                if item[1] == '' or conf.get(item[1], false)
+                if item[1] == '' or conf.get(item[1]) == 1
                         install_data(item[0],
                                      install_dir : zshcompletiondir)
                 endif