Rename jerry-libm to jerry-math (#4410)

That "libm" in the name of the library resulted in awkward naming
on *nix systems (`libjerry-libm.*`, "lib" occurring twice). And the
name of the corresponding header is `math.h` anyway.

Note that this is a breaking change in some sense. The commit
contains no API change, but the build system does change for users
of the math library.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

tools/check-cppcheck.sh

@@ -25,11 +25,11 @@ fi
 JERRY_CORE_DIRS=`find jerry-core -type d`
 JERRY_EXT_DIRS=`find jerry-ext -type d`
 JERRY_PORT_DIRS=`find jerry-port -type d`
-JERRY_LIBM_DIRS=`find jerry-libm -type d`
+JERRY_MATH_DIRS=`find jerry-math -type d`
 
 
 INCLUDE_DIRS=()
-for DIR in $JERRY_CORE_DIRS $JERRY_EXT_DIRS $JERRY_PORT_DIRS $JERRY_LIBM_DIRS
+for DIR in $JERRY_CORE_DIRS $JERRY_EXT_DIRS $JERRY_PORT_DIRS $JERRY_MATH_DIRS
 do
   INCLUDE_DIRS=("${INCLUDE_DIRS[@]}" "-I$DIR")
 done
@@ -44,4 +44,4 @@ cppcheck -j$CPPCHECK_JOBS --force \
   --exitcode-suppressions=tools/cppcheck/suppressions-list \
   --suppressions-list=tools/cppcheck/suppressions-list \
   "${INCLUDE_DIRS[@]}" \
-  jerry-core jerry-ext jerry-port jerry-libm jerry-main tests/unit-*
+  jerry-core jerry-ext jerry-port jerry-math jerry-main tests/unit-*