Use CPPFLAGS (not CFLAGS) for header directories (mpsolve patch)

Author: d-torrance

M2/libraries/mpsolve/patch-3.2.2

@@ -15,8 +15,20 @@ Otherwise we get the following compile error in macOS:
  include/mps/types.h | 6 +++++-
  1 file changed, 5 insertions(+), 1 deletion(-)
 
-diff --git a/include/mps/types.h b/include/mps/types.h
-index e3465aa5..4f427f59 100644
+From 449d608b360fea0056049d7f8e874ea022fadab5 Mon Sep 17 00:00:00 2001
+From: Doug Torrance <dtorrance@piedmont.edu>
+Date: Sat, 9 Aug 2025 09:49:08 -0400
+Subject: [PATCH] Use CPPFLAGS instead of CFLAGS for specifying header
+ directories
+
+CPPFLAGS appear before CFLAGS, so if the user passes some directories
+manually using CPPFLAGS, they will appear first.  This is a problem if
+these directories contain older versions of the mpsolve headers.  We
+want to ensure that the current versions are found first.
+---
+ src/mpsolve/Makefile.am | 6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
 --- a/include/mps/types.h
 +++ mpsolve-3.2.2/include/mps/types.h
 @@ -21,7 +21,11 @@ typedef bool mps_boolean;
@@ -32,6 +44,23 @@ index e3465aa5..4f427f59 100644
  #ifndef isnan
            # define isnan(x) \
    (sizeof(x) == sizeof(long double) ? isnan_ld (x) \
+--- a/src/mpsolve/Makefile.am
++++ mpsolve-3.2.2/src/mpsolve/Makefile.am
+@@ -6,10 +6,12 @@ man_MANS = ${builddir}/mpsolve.1
+ 
+ EXTRA_DIST = mpsolve.1
+ 
+-mpsolve_CFLAGS = \
++mpsolve_CPPFLAGS = \
+         -I${top_srcdir}/include \
+ 	-I. \
+-	-I${top_builddir}/include \
++	-I${top_builddir}/include
++
++mpsolve_CFLAGS = \
+ 	$(GMP_CFLAGS) \
+ 	$(GTK_CFLAGS) \
+ 	$(PTHREAD_CFLAGS) \
 -- 
 2.43.0