[gimp] libgimpmath: remove gimpmath.h from introspection.

[Jehan <jehanp src gnome org>]

commit f4f63dad9cef5e82b92aad0e1f040d19eec4d21b
Author: Jehan <jehan girinstud io>
Date:   Mon Aug 5 16:42:16 2019 +0200

    libgimpmath: remove gimpmath.h from introspection.
    
    This header is just full of macros and GI doesn't introspect macros
    anyway. Yet it was still bothering us with warnings.

 libgimpmath/Makefile.am | 1 +
 libgimpmath/Makefile.gi | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/libgimpmath/Makefile.am b/libgimpmath/Makefile.am
index e23a38e7a9..48a86ba67b 100644
--- a/libgimpmath/Makefile.am
+++ b/libgimpmath/Makefile.am
@@ -65,6 +65,7 @@ libgimpmath_@GIMP_API_VERSION@_la_SOURCES = \
        $(libgimpmath_introspectable)
 
 libgimpmathinclude_HEADERS = \
+       $(top_srcdir)/libgimpmath/gimpmath.h    \
        $(libgimpmath_introspectable_headers)
 
 libgimpmath_@GIMP_API_VERSION@_la_LDFLAGS = \
diff --git a/libgimpmath/Makefile.gi b/libgimpmath/Makefile.gi
index 69c5268d61..6ff978d7ef 100644
--- a/libgimpmath/Makefile.gi
+++ b/libgimpmath/Makefile.gi
@@ -1,7 +1,6 @@
 # Introspectable sources for libgimpmath
 #
 libgimpmath_introspectable_headers = \
-       $(top_srcdir)/libgimpmath/gimpmath.h            \
        $(top_srcdir)/libgimpmath/gimpmathtypes.h       \
        $(top_srcdir)/libgimpmath/gimpmatrix.h          \
        $(top_srcdir)/libgimpmath/gimpvector.h