Since the addition of the RPM macros for ninja, the vim plugin is broken.
I fixed it with this patch:

diff --git a/ninja-build.spec b/ninja-build.spec
index dc0a595..7f4a6e6 100644
--- a/ninja-build.spec
+++ b/ninja-build.spec
@@ -1,11 +1,12 @@
 Name:           ninja-build
 Version:        1.7.1
-Release:        2%{?dist}
+Release:        2%{?dist}.0.teuf
 Summary:        A small build system with a focus on speed
 License:        ASL 2.0
 URL:            http://martine.github.com/ninja/
 Source0:        https://github.com/martine/ninja/archive/v%{version}.tar.gz#/ninja-%{version}.tar.gz
-Source1:        macros.ninja
+Source1:        ninja.vim
+Source2:        macros.ninja
 # Rename mentions of the executable name to be ninja-build.
 Patch1000:      ninja-1.7.1-binary-rename.patch
 # Disable a test which takes too many resources for koji.
@@ -26,6 +27,7 @@ fast as possible.
 %prep
 %autosetup -n ninja-%{version} -p1
 cp -p %{SOURCE1} .
+cp -p %{SOURCE2} .

 %build
 CFLAGS="%{optflags}" LDFLAGS="%{?__global_ldflags}" \
@@ -41,7 +43,7 @@ install -Dpm0644 misc/ninja-mode.el %{buildroot}%{_datadir}/emacs/site-lisp/ninj
 install -Dpm0644 misc/ninja.vim %{buildroot}%{_datadir}/vim/vimfiles/syntax/ninja.vim
 install -Dpm0644 %{SOURCE1} %{buildroot}%{_datadir}/vim/vimfiles/ftdetect/ninja.vim
 install -Dpm0644 misc/zsh-completion %{buildroot}%{_datadir}/zsh/site-functions/_ninja
-install -Dpm0644 macros.ninja %{buildroot}%{rpmmacrodir}/macros.ninja
+install -Dpm0644 %{SOURCE2} %{buildroot}%{rpmmacrodir}/macros.ninja

 %check
 ./ninja_test