build: obey CFLAGS from libosmocore

When libosmocore is installed with an non standard prefix, the build
fails with non-found headers. e.g.

../liblogging/logging.h:3:10: fatal error: osmocom/core/logging.h: No such file or directory

src/libdtmf/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = libdtmf.a
 

src/libjitter/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = libjitter.a
 

src/liblogging/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = liblogging.a
 

src/liboptions/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = liboptions.a
 

src/libsample/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = libsample.a
 

src/libwave/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 noinst_LIBRARIES = libwave.a
 

src/router/Makefile.am

@@ -1,4 +1,11 @@
-AM_CPPFLAGS = -Wall -Wextra -g $(all_includes)
+AM_CPPFLAGS = \
+        $(all_includes) \
+        $(NULL)
+
+AM_CFLAGS = \
+        -Wall -Wextra \
+        $(LIBOSMOCORE_CFLAGS) \
+        $(NULL)
 
 bin_PROGRAMS = \
 	osmo-cc-router