package/libgeotiff: fix build without C++

Do not check for C++ compiler as libgeotiff is written in C otherwise
build will fail on toolchains without a working C++ compiler:

checking how to run the C++ preprocessor... /lib/cpp
configure: error: in
`/data/buildroot/buildroot-test/instance-1/output/build/libgeotiff-1.4.2':
configure: error: C++ preprocessor "/lib/cpp" fails sanity check

Fixes:
 - http://autobuild.buildroot.org/results/72f1c5c1b8fc337a1cff4b280abe99afd65f945b

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 2693362a04912462c0b8c02348607fb110f667f5)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libgeotiff/0003-libgeotiff-configure.ac-do-not-check-for-C.patch

@@ -0,0 +1,65 @@
+From edc9ec69b43c27955ee4f24db2e6808bb1a8974d Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 3 Feb 2019 23:20:43 +0100
+Subject: [PATCH] libgeotiff/configure.ac: do not check for C++
+
+Do not check for C++ compiler as libgeotiff is written in C otherwise
+build will fail on toolchains without a working C++ compiler:
+
+checking how to run the C++ preprocessor... /lib/cpp
+configure: error: in `/data/buildroot/buildroot-test/instance-1/output/build/libgeotiff-1.4.2':
+configure: error: C++ preprocessor "/lib/cpp" fails sanity check
+
+Fixes:
+ - http://autobuild.buildroot.org/results/72f1c5c1b8fc337a1cff4b280abe99afd65f945b
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/OSGeo/libgeotiff/pull/9]
+---
+ libgeotiff/configure.ac | 6 ------
+ 1 file changed, 6 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index a334416..4ebbd6f 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -25,8 +25,6 @@ dnl #########################################################################
+ AM_INIT_AUTOMAKE
+ AM_MAINTAINER_MODE
+ AC_PROG_CC
+-AC_PROG_CXX
+-AC_PROG_CXXCPP
+ AC_PROG_INSTALL
+ AC_PROG_LN_S
+ AC_PROG_MAKE_SET
+@@ -46,7 +44,6 @@ dnl #########################################################################
+ m4_define([debug_default],[no])
+ 
+ CFLAGS="$CFLAGS"
+-CXXFLAGS="$CXXFLAGS"
+ 
+ dnl We want to honor the users wishes with regard to linking.
+ LIBS="$LDFLAGS $LIBS"
+@@ -82,11 +79,9 @@ AC_MSG_CHECKING([for debug enabled])
+ 
+ if test "x$enable_debug" = "xyes"; then
+     CFLAGS="$CFLAGS -g -DDEBUG -Wall"
+-    CXXFLAGS="$CXXFLAGS -g -DDEBUG -Wall"
+     AC_MSG_RESULT(yes)
+ else
+     CFLAGS="$CFLAGS -O3 -DNDEBUG"
+-    CXXFLAGS="$CXXFLAGS -O3 -DNDEBUG"
+     AC_MSG_RESULT(no)
+ fi
+ 
+@@ -367,7 +362,6 @@ LOC_MSG()
+ LOC_MSG([  Version..................: ${RELEASE_VERSION}])
+ LOC_MSG([  Installation directory...: ${prefix}])
+ LOC_MSG([  C compiler...............: ${CC} ${CFLAGS}])
+-LOC_MSG([  C++ compiler.............: ${CXX} ${CXXFLAGS}])
+ 
+ LOC_MSG([  Debugging support........: ${enable_debug}])
+ LOC_MSG()
+-- 
+2.14.1
+