+ .gitlab.ci comment; + include inttypes.h for printf 'L' under MinGW

.gitlab-ci.yml

@@ -133,6 +133,7 @@ windows:
   script:
     - New-Item -ItemType "directory" -Confirm:$false -Force:$true -Name "build"
     - cd build
+    # We want to compile with MinGW. Somehow this is accompished by Ninja.
     - cmake -G "Ninja" -DLIB_MAN=OFF -DCMAKE_INSTALL_PREFIX=C:\opt\x64 -B. ..
     - cmake --build . # --config Release
     - Get-Location

lib/kww.c

@@ -38,7 +38,10 @@
 #include <math.h>
 #include <float.h> // OBSOLETE
 #include <errno.h>
+#include <inttypes.h> // for printf 'L' under MinGW
+
 #include "kww.h"
+
 #define PI           3.14159265358979323846L  /* pi */
 #define PI_2         1.57079632679489661923L  /* pi/2 */
 #define SQR(x) ((x)*(x))